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Mounting Bracket for Optronics A91, AL82, AL90, AL91, or AL191 Series Lights - Open Back - Black

Mounting Bracket for Optronics A91, AL82, AL90, AL91, or AL191 Series Lights - Open Back - Black

Item # A91BOB
Our Price: $8.27
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Black plastic bracket lets you install an Optronics A91 Series, AL82 Series, AL90 Series, AL91 Series, or AL191 Series trailer light. Surface mount on 2" centers - hardware sold separately. Open back allows room for wiring. 1-800-940-8924 to order Optronics accessories and parts part number A91BOB or order online at Free expert support on all Optronics products. Great prices and Fastest Shipping for Mounting Bracket for Optronics A91, AL82, AL90, AL91, or AL191 Series Lights - Open Back - Black. Accessories and Parts reviews from real customers.
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  • Reviews (108)
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Optronics Accessories and Parts - A91BOB

  • Trailer Lights
  • Mounting Hardware
  • Brackets
  • Optronics
  • Black

Black plastic bracket lets you install an Optronics A91 Series, AL82 Series, AL90 Series, AL91 Series, or AL191 Series trailer light. Surface mount on 2" centers - hardware sold separately. Open back allows room for wiring.


  • Mounting bracket for Optronics A91 Series, AL82 Series, AL90 Series, AL91 Series, or AL191 Series trailer clearance/side marker lights
  • Gasket creates a weathertight seal
  • Surface-mount design - hardware sold separately
  • Open back allows room for wiring
  • Two-wire harness for light sold separately
  • Black molded plastic construction


  • Dimensions: 2-7/8" long x 1-1/2" wide x 1/2" deep
  • Mounting hole dimensions (center to center): 2"
  • 3-Year warranty

dimensions of open back base

A91BOB Optronics Black Plastic Base for A91, AL82, AL90, AL91, or AL191 Series Trailer Clearance/Side Marker Light

Alternate part number: A-91BOB

California residents: click here

Video of Mounting Bracket for Optronics A91, AL82, AL90, AL91, or AL191 Series Lights - Open Back - Black

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Lights Mounting Bracket Installation

Shane: Hey. Hi, Shane here with Today we're going to be taking a look at Optronics mounting bracket for Optronics A Series lights. This is what our bracket's going to look like when it's installed. It's going to be a very durable plastic construction. It's going to be a surface mount.

It's going to have a foam backing to help seal the backside of the light. It's going to have an open back. Allow you to run your lights or run your wires from your lights much easier. It's going to allow you to snap your light into place. These are also going to be available in chrome.

These are designed to work with A91, AL82, AL90, AL91 or AL191 Series lights. You can find each one of those lights here at Keep in mind mounting hardware is not included with this light. Again, with this bracket, the light is just going to snap into place. Makes it very easy to attach and detach the light.That's going to do it for our look at Optronics mounting bracket for A Series lights..

Customer Satisfaction Score:

Customer Reviews

Mounting Bracket for Optronics A91, AL82, AL90, AL91, or AL191 Series Lights - Open Back - Black - A91BOB

Average Customer Rating:  4.7 out of 5 stars   (108 Customer Reviews)

Black plastic bracket lets you install an Optronics A91 Series, AL82 Series, AL90 Series, AL91 Series, or AL191 Series trailer light. Surface mount on 2" centers - hardware sold separately. Open back allows room for wiring.


The mounting brackets are well made and very durable. I like the Open Back design as it allows clearance for the electrical connector. I also liked the foam backing as it made a good, clean seal/finish on the final project.

I mounted them on my boat trailer using #8 stainless hardware without issue. I have a black trailer and these matched nicely!

I would buy again!


Worked great with the Amber LED side marker lights.


The materials order were great! My order Was processed quickly and arrived promtly. Will Continue to go Etrailer for my Material needs.


Great replacement for my boat trailer.


Absolutely excellent service. Kate was very knowledgeable, friendly and willing to help me. I received the correct product in record time! Thank you Kate!


Blaa Blaa Blaa. Yada Yada Yada. Cheap overpriced plastic. Hope they work!



Still cheaply made overpriced plastic!


You wouldn't think something like getting replacement running lights would be that complex but frankly it is. With the various options and manufacturers its a nightmare. After searching the desert of the internet for correct information I stumbled upon this oasis of information from etrailer to get the right lights and mounting brackets. I now understand what the "e" stands for in their name, they make trailer stuff "easy".


I've always had good luck when I buy from etrailer. I've been working on my boat trailer and small utility trailer and purchased items for both. I'm very happy with the products so far. I've installed everything that I bought, but it's impossible to send any pictures because both trailers are covered and put away for the winter. Keep up the great work.


I purchased these as more of an insurance policy when I changed out the lights on my Shoreland'r trailer. I wasn't sure if the new lights would fit into the existing housings. They fit perfectly!. These brackets have the same mounting hole pattern and dimensions as the stock trailer housings, so when I decide to change them out, it will be a breeze!!


Purchased fenders from etrailer. Selection was great, priced competitively and shipping quicker than expected. Also purchased marker lights, which were easily installed in fenders.


seems like just last week I was saying how much i liked the led lights and where would they be without the mounting brackets? its all good and thats the truth!
me so happy ;-)


Good look and great fit around the light fixture.


mounted to hold Optronics Mini Thinline LED clearance lights


The light I ordered are excellent. I replaced all the lights on my boat trailer to LED. The first trip to lake with the boat, got many comments from other boat owners at the lake. I told them about etrailer. I know they will be as satisfied as I am. Thanks etrailer.

From now on I will buy all my stuff from etrailer!!!


bought as part of a larger order to replace the incandescent marker lights on my boat trailer. All components fit together well - resulting in a professional, neat installation.


Disappointed that the mounting bracket and pigtail were sold separately. Also the pigtail protrudes beyond the surface of the mounting bracket,creating additional work in mounting.


I friend told me about a couple of years ago and for that I'm grateful. I can locate any obscure light for my trailer and have it shipped to my door! This saves a lot of time from shopping local stores when I'm trying to locate a part. The prices are less than my local stores too!


Everything was received exactly as described, and on-time. I had a few questions since we were in the middle of a hurricane, and Angie responded quickly and thoroughly. Etrailer is definitely my go-to for trailer-related products from now on!


I have to say it's an absolute pleasure dealing with etrailer. Not only did my package arrive on time as promised but the experience of dealing with the people at etrailer such as Tommy and Dani made it that much more of fun experience. There was not a problem with answering my questions if they did not know the answer they found out the answer and got back in touch with me. Their prices are great their products are good quality and there's so many good things to say about the company that I could go on and on. Keep up the good work and I will be doing all my trailer business with etrailer. Just check out their website and see how much more they have to offer.


I ordered these plastic mounts to replace the factory marker light mounts on my SnoLandr snowmobile trailer. I found these on the etrailer site and they were very similar. Thank you guys


God I love these replacement lights ! they fit my Trailstar trailer perfect . Do you have the little ones for corner by the tires ? If so I will take them too.


These marker lights are great and easily mounted and wired into my Shorelander trailer.


I purchased bearing and hubs for a utility trailer over a year ago, they are still working perfectly, have been very happy with the quality


Nice quality and cords hold up great.


Easy to install great material and worked perfectly with the replacement LED bulbs for a clean factory look.

Show More Reviews

See what our Experts say about this Optronics Accessories and Parts

  • Why Don't Trailer Clearance Lights Attach to Trailer Using Adhesive
    Over time a light held on with an adhesive would run a much higher risk of coming unattached than one with solid install hardware which is why the trailer lights we offer either install using nuts/bolts or by fitting into a hole in the trailer and using a correct sized grommet. I attached a link to a page that has all of the LED trailer clearance lights we offer. If you wanted to send me a picture of your trailer where you want to install the lights I can help pick out what you might need.
    view full answer...
  • What Hardware is Best for Mounting Trailer Light Mounting Bracket to the Trailer Surface
    It depends on the material of the trailer surface you are wanting to mount it on. You could use screws on wood surfaces, self-tapping screws for sheet metal, or nuts and bolts would work on sheet metal. To remove the old ones, you can drill out the rivet, or they may be plastic pop-in rivets that you may be able to pry out with a screw driver.
    view full answer...
  • Optronics Mounting Bracket with Wedge
    I have a solution for you but I am sorry I am not seeing anything in our system or online with A-91G15B. It may be an outdated part that has been discontinued. I would guess someone just used a different mounting bracket on one of the sides. We do have an angled mounting bracket that is similar to the item # A91GB you referenced. It is Mounting Grommet w/ Built-in Wedge for A91 or AL91 Series Lights - Black item # A91GZB. The black PVC grommet has built-in wedge that allows A/AL91 series...
    view full answer...
  • Does Light Bracket # A91BOB Fit LED Taillight # LPL91CB
    Yes the bracket part # A91BOB is compatible with the LED light part # LPL91CB that you referenced.
    view full answer...
  • Can the Optronics AL91AB Light Be Mounted Vertically
    Yes, you can mount this Optronics Trailer Light # AL91AB basically in any way you like as long as it visible. You will need to consult your local laws and regulations to determine which mounting positions are legal. I attached a review video for this product for you to check out also. You might also be interested in purchasing a Black Mounting Bracket # A91BOB to help you install the # AL91AB. I attached a review video for this product for you to check out also.
    view full answer...
  • Mounting Bracket Recommendations For Optronics Thinline LED Clearance and Side Marker Light
    For the # AL91RB trailer lights we have a couple options for mounting brackets. For a self-grounding bracket where the light is grounded through the mounting hardware I recommend part # A91BB. The gasket is included. For a mounting bracket that has an open back you need part # A91BOB.
    view full answer...
  • Size of Mounting Hole Required for Installing Optronics Grommet # A91GB
    The Optronics Grommet # A91GB that you referenced, which is designed to work with the Thinline LED # AL91RB that you were looking at, will install into a mounting hole on the trailer that is 2-7/8 inches across and 1-1/2 inches tall. If you do not have this type of mounting hole on your trailer, you can use the Mounting Bracket # A91BOB instead, which will allow for a surface mount installation. I have attached a couple short video demonstrations on these products that you can also check out.
    view full answer...
  • Replacement 2-1/2 Inch Long Optronics Marker Lights for Cargo Trailer
    The closest Optronics trailer light assembly we have available to your existing unit is the Optronics Thinline LED # AL91RB. This LED light measures 2-1/2 inches long and 1-3/16 inches wide. The mounting bracket # A91BOB it is used with (not included with the light) features bolt holes that measure 2 inches apart on center. Unfortunately the SAE P2 P3 number you found on the lens of your existing light doesn't indicate the actual light model but has to do with DOT regulations. If the...
    view full answer...
  • Does The Optronics LED Side Marker Light # AL91AB have 2 Male Connector Posts
    Yes, The Thinline LED Clearance and Side Marker Light # AL91AB has 2 male connector posts on it. This waterproof trailer light functions as both a clearance light and a side marker light when properly mounted. It is 2-1/2 inches long by 1-3/16 inches wide by 7/8 inches deep. The Right Angle 2-wire pigtail # A46PB and The Mounting Bracket # A91BOB are sold separately. I attached a review video link below.
    view full answer...
  • Recommended Wiring and Bracket for an Optronics AL91AB
    We definitely have the wiring and brackets needed to get you up and running. With that being said, you will need the Right Angle 2-Wire Pigtail # A46PB and the Mounting Bracket for Optronics AL91 # A91BOB. The # AL91AB lights will snap into the # A91BOB and then the # A46PB will plug directly into the back.
    view full answer...
  • Difference Between Optronics Lights AL90RB and AL91RB
    The Optronics FLEET Count Mini Thinline Sealed LED Marker/Clearance Light # AL90RB has a single LED element while the similar Thinline LED Clearance and Side Marker Light # AL91RB has three LEDs for brighter output and it is submersible. Both can mount using either grommet # A91GB or bracket # A91BOB.
    view full answer...
  • Does Optronics Mini Thin Line Sealed LED Marker/Clearance Light # AL82AB Have Power and Ground Wire
    The Optronics Mini Thin Line Sealed LED Marker/Clearance Light # AL82AB that you referenced have a power and ground wire that comes out of the back of the light. The recommended base with this light is part # A91BOB. But if you are asking about wiring you can easily wire these lights to your existing trailer wiring. White is ground black is power.
    view full answer...
  • Surface Mount Bracket Recommendation for Trailer Clearance Light part # AL82AB
    The surface mount bracket you need is the part # A91BOB for the light part # AL82AB that you referenced.
    view full answer...
  • Recommendation For Replacing A Grote 45253 Light With An LED Light On A Pleasure-Way Excel Motorhome
    Though we do have direct replacements for the Grote 45253 light you have, they will be incandescent as well so won't be what you are looking for. With that said, as the spot where a light can mount will limit the size you can go with, I think the Optronics Mini Thinline LED Clearance and Side Marker Light # AL82AB with the # A91BOB mounting bracket will be your best option. This will be a little smaller and you will need to drill new mounting holes as they will be 2" apart, but the overall...
    view full answer...
    Image 1 for Image 2 for
  • How to Determine if Amber Clearance Light Will Work on Trailer
    In order to determine if the Thinline LED Clearance and Side Marker Light # AL91AB will fit your trailer you simply need to measure your light and see if it matches; this light is 2-1/2" long x 1-3/16" wide x 7/8" deep. It is also a great option because it can be either recess or surface mounted. For a surface mount you will use Self-Grounding Mounting Bracket # A91BOB with Plug # A91LW. For a recess mount you will use Grommet # A91GB with Right Angle 2-Wire Pigtail # A46PB. I have added...
    view full answer...
  • Red Trailer Clearance Light That Measures 2-1/2 Inches x 1 Inch
    We have trailer clearance lights that are about 2-1/2" x 1" but clearance lights will only have 2 wires (power and ground) so there are no 3-wire clearance lights. Tail lights can have 3 wires but there are none that are as small as what you mentioned. So I recommend using a 2-wire light: - Optronics Mini ThinLine LED Clearance and Side Marker Light # AL82RB For a mounting bracket with the light you will need either Mounting Bracket # A91OB (Chrome) or # A91BOB (Black) I have added links...
    view full answer...
  • Trailer Red LED Clearance Light Replacement Option For 2" Light With 3" Mounting Bracket
    I appreciate all that info and while we don't have an exact replacement we do have something that can work for you. You can use a different style bracket that is close in length, 2-7/8" long with mounting holes 2" apart on center. For the light, bracket and wiring you can use the following: - Thinline LED Clearance and Side Marker Lightm # AL91RB - Mounting Bracket - Black # A91BOB or Chrome # A91OB - Right Angle 2-Wire Pigtail # A46PB This would be the closest we can get to an exact...
    view full answer...
  • Mounting Options for LED Clearance and Side Marker Lamp Part # AL82AB
    The clearance and side marker light you referenced, part # AL82AB, uses a plastic mounting base that is sold separately. The base is available in a black (part # A91BOB) or chrome (part # A91OB) finish. If the appropriate sized hole is available, the lamp can be flush mounted using a grommet mount, part # A91GB.
    view full answer...
  • Recommended Side Marker Lights for EZLoader Trailer
    I can help you find the correct parts for your EZ Loader trailer. Based on the photos you submitted, the # AL91RB will fit your style connector on your trailer. The amber light is # AL82AB, and the grommet you will need is # A91BOB. All these items come in quantity of 1 so you will want to adjust the quantity on the grommets page to 2. I have linked all the above products to this page for your convenience.
    view full answer...
    Image 1 for Image 2 for
  • Red Side Marker and Clearance Lights for a Trailer or Coach
    Yes, you would need Thinline LED Clearance and Side Marker Light - Submersible # AL91AB. For installation, you will also need a bracket. For black use part # A91BOB. For chrome use # A91OB.
    view full answer...
  • How Does the Flush Mount Grommet # A91GB Install a # AL91AB Light Into a Trailer
    All the parts you ordered are designed to work together, but the grommet part # A91GB is for flush mounting the Optronics Light part # AL82AB that you have. This grommet will get installed into a hole in on your trailer that is about 2-7/8 inches across and 1-1/2 inches tall. If you do not have a hole with those dimension you might be better served getting a Black Mounting Bracket # A91BOB to allow you to surface mount the # AL82AB.
    view full answer...
  • Parts Needed to Install Optronics Submersible Red LED Clearance and Side Marker Light AL91RB
    The Optronics Thinline Submersible Red LED Clearance and Side Marker Light # AL91RB installs using a base, part # A91BOB in black or part # A91OB in chrome finish. A 2-wire pigtail # A46PB will allow for electrical installation. The white wire on the pigtail is ground. If your original light used only 1 wire then its base provided the ground connection. In this case you can use the self-grounding base # A91BB in black or # A91CB in chrome finish. In this case you will use Single Wire #...
    view full answer...
  • Will LED Clearance Light Work With One Wire
    Yes, the Thinline LED Clearance and Side Marker Light - Submersible # AL91AB will work with your single power wire, as it uses a 2-wire (one for power, one for ground) pigtail or 1-wire pigtail with a self-grounding bracket. To mount this light you have a couple options. The first is the Mounting Bracket # A91BOB with Right Angle 2-Wire Pigtail # A46PB; you'd also want to use the Self-Tapping Screw # 1131832. Your other option to mount this light is to use Self-Grounding Mounting Bracket...
    view full answer...
    Image 1 for
  • Wiring Pigtail and Mounting Bracket Options For Installing Thinline LED Clearance And Marker Lights
    The Thinline LED Clearance and Side Marker Light # AL91AB require certain mounting brackets and plugs that are either already installed on the trailer or are available separately. A Right Angle 2-Wire Pigtail # A46PB will work with the Grommet # A91GB if you are looking to recess the light. Or Mount Brackets # A91OB and # A91BOB if you want to mount them on a surface with the wiring running behind the bracket. The Plug - Single Wire # A91LW is used for Mounting Brackets # A91BB and...
    view full answer...

Do you have a question about this Accessories and Part?

Info for this part was:

Employee Patrick B
Expert Research:
Patrick B
Employee Jameson C
Expert Research:
Jameson C
Employee Adele M
Updated by:
Adele M
Employee Laura H
Updated by:
Laura H
Employee Amy B
Updated by:
Amy B
Employee Brian T
Updated by:
Brian T
Employee Noah M
Updated by:
Noah M
Employee Cole B
Installed by:
Cole B
Employee Chris R
Video Edited:
Chris R
Employee Shane H
Test Fit:
Shane H
Employee Jonathan Y
Video by:
Jonathan Y

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