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Rubber Grommet for 2-1/2" Round Trailer Lights - Recessed Mount - Open Back

Rubber Grommet for 2-1/2" Round Trailer Lights - Recessed Mount - Open Back

Item # A57GB
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Accessories and Parts A57GB - Grommet - Optronics
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This rubber grommet allows you to recessed mount a 2-1/2" diameter sealed trailer light. Protects lights against shock and vibration for extended life. Open back design provides easy access to wiring. 1-800-940-8924 to order Optronics accessories and parts part number A57GB or order online at Free expert support on all Optronics products. Great prices and Fastest Shipping for Rubber Grommet for 2-1/2" Round Trailer Lights - Recessed Mount - Open Back. Accessories and Parts reviews from real customers.
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  • Reviews (50)
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Optronics Accessories and Parts - A57GB

  • Trailer Lights
  • Mounting Hardware
  • Grommet
  • Round
  • Optronics
  • 2-1/2 Inch Diameter

This rubber grommet allows you to recessed mount a 2-1/2" diameter sealed trailer light. Protects lights against shock and vibration for extended life. Open back design provides easy access to wiring.


  • Rubber grommet allows you to recessed mount a 2-1/2" diameter sealed light
  • Designed to protect your light against shock and vibration for extended life
  • Open back design provides easy access to wiring
  • Durable PVC construction
  • Reccessed mount application
    • Requires a 2-3/4" diameter cutout for installation
  • Access hole on the side of grommet allows for wiring connection

Manufacturer Cross Reference
Grommet will work as an exact replacement for:
Uni Bond # GR2502
Truck Lite # 10700
Grote # 91400
Peterson # 143-18

Optronics A57GB Open Back Grommet Dimensions

A57GB Rubber Grommet for Optronics 2-1/2" Round Sealed Lights - Recessed Mount - Open Back

Alternate part number: A-57GB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Rubber Grommet for 2-1/2" Round Trailer Lights - Recessed Mount - Open Back - A57GB

Average Customer Rating:  4.8 out of 5 stars   (50 Customer Reviews)

This rubber grommet allows you to recessed mount a 2-1/2" diameter sealed trailer light. Protects lights against shock and vibration for extended life. Open back design provides easy access to wiring.


Broke one of my warning lights and stretched out the rubber grommets. Perfect fit and matched my existing lights like nothing ever happened. Awesome price and was delivered quickly. You have a customer for life thank you.


Agent was very helpful finding cross referenced parts for me


Great customer service, quickly delivery, products were as described and in the pictures


Perfect fit as a replacement on the truck bed


Arrived quickly and exactly what I need ed!


Exact replacement for the damaged ones on my PJ gooseneck trailer. Seem to be very nice quality for the price and were simple to replace.


The lights are fine but the 2 1/2" grommets are too small for PJ trailers. Had to reuse the old ones.


Fits perfectly, replaced original grommet because of being torn and the original light no longer working. The light and Gromit was ordered, and received on time .


The Grommets are perfect for my need. I had just bought a new utility trailer and 3 of grommets were damaged during installation and I wanted to replace the damaged grommets and this was the easiest way to accomplish that.


etrailer had exactally what I was looking for. Their web site is very helpful. I received the order quickly.


Heavy duty and durable makes an excellent addition to creating the ultimate flush mount lighting configurations.. Most definitely pleased!


All the items were excellent quality, well packed, and worked perfectly. Will definitely order again if I need anything else for my trailer.


it took me awhile to install these, they fit the bracket (sold elsewhere) snugly, and hold the lens very well.


Just what I needed. Perfect replacement. Great service and the website made ordering easy.


Worked great!


This grommet fit perfectly and replaced the original one on the trailer.


Timely, correct description, complete
way E-commerce should strive to be -


product is great but the two day priority mail sucks took a week to get here


Works well


Worked great and fits


Great product, customer service and fast shipping. Will be a returning customer.


Quick, fast and easy!! Not to mention good quality. Really like the up to date tracking feature. Keep up the good work!


Great product for a great price as usua l.


Awesome! Exactly what we hoping for- worried they wouldnt be right.


The exact part that I needed. I could not find it at the local stores. The price was very fare.

Show More Reviews

See what our Experts say about this Optronics Accessories and Parts

  • Can Optronics Sealed 2-1/2 Inch Light be Mounted in a 2-7/8 Inch Hole
    In order to install this light, you will need a grommet to fit the hole. We have a grommet for a 2-25/32 hole, which is just under 2-7/8 as well as a grommet that fits a 3 inch hole. If you can re-measure the hole with something that has 16th inch or 32nd increments we can get a more accurate measure of the hole. If it is a 2-25/32 inch hole, you would use grommet # A57GB. If you find it is a 3 inch hole, you can use part # A55GB. Both of these grommets will work with the MC57AB.
    view full answer...
  • Rubber Mounting Gasket for Optronics Round Trailer Clearance Side Marker Light # MC57RB
    There is indeed a rubber mounting grommet available for use with the Optronics Round Trailer Clearance Side Marker Light # MC57RB that you referenced. The part you will need for use with this light is part # A55GB. This grommet provides a degree of shock-mounting for the light and allows flush-mounting. It provides an open back for convenient wiring access. We also offer grommet # A57GB that allows recessed-mounting in a 2-3/4-inch mounting hole.
    view full answer...
  • Availability of a Flush Mounted 2-1/2 inch Diameter GLO Light Led Trailer Light
    The Optronics GloLight # MCL157RB that you referenced is designed to be recess mounted with the Recess Flange # A57GB. While it wouldn't quite be as flush mounted as the Optronics GLOLight LED Stop/Turn/Tail Light # STL101RFMB that you also have it would look pretty good on your trailer. For a very similar 2-1/2 inch LED light that is designed to be flush mounted check out the # MC57RB. For a flush mounted grommet you would want part # A55GB.
    view full answer...
  • Replacement Amber Clearance Light for Dutchman Kodiak
    The lenses on clearance lights are not generally removable as they are often "sonically sealed" such as the Optronics Trailer Clearance or Side Marker Light # MC57AB; this means they are submersible. Instead of buying a light and taking the lens off I strongly recommend an LED Trailer Clearance or Side Marker Light w/ Reflex Reflector # MCL59AB for your Dutchman trailer because an LED is a far better, much longer lasting option. You only need to make sure your existing lights have the...
    view full answer...
    Image 1 for
  • Marker Light to Replace Peterson 143 on 2007 Fleetwood Pop Up Camper
    I did some research, and found that the Peterson 143 is a flush grommet mount lamp, not a flange mount. The lamp itself is 2-1/2 inches in diameter. The Optronics # MC57AB would be a comparable replacement. You'd also need a # A57GB grommet and a # A46PB pigtail. If the # MC57AB doesn't match your lamp, please send me a reply email with a photo of the lamp attached, and I'd be happy to try to find a replacement for you.
    view full answer...
  • Red and Amber 2-1/2 Inch Round LED Trailer Lights with Grommet and Plug
    We can get you set up with red and amber clearance lights, grommets, and plugs for your trailers (the prices can be seen on the product pages). The red clearance lights are compatible with either 12 volt or 24 volt systems, though when I spoke with Optronics they told me the matching amber lights are obsolete, which means there are only 12 volt amber LED clearance lights. Here are the parts you will need: - LED Clearance or Side Marker Light - Submersible - 3 Diodes - Red Lens - 12V/24V...
    view full answer...
  • Recommended Trailer 2-1/2 Inch Clearance Light and Grommet
    The closest grommet we carry to your 2-11/16 inches hole is the Optronics # A57GB. This is made to fit into a 2-25/32 inch opening which is going to be extremely close. Being that it's rubber I would imagine you could make it work even if you have to file out the hole ever so slightly. For a 2-1/2 inch submersible LED light the Optronics # MCL59RB will pair well with the 2-Wire Pigtail # A46PB.
    view full answer...
  • Trailer Clearance Light Recommendation to Fit 2-3/4 inch Diameter Hole
    For a grommet that fits the diameter hole of 2-3/4 inches we have the part # A57GB which fits lights that are 2-1/2 inches in diameter like the Miro-Flex LED Trailer Clearance or Side Marker Light # MCL51RB. You'd need these two things plus a wiring pigtail part # A46PB and you'd be set.
    view full answer...
  • Recommended Grommets Brackets And Plugs For 2 Inch LED Utility Light
    For the Optronics Clear LED Round Utility Light, part # UCL55CB, the grommet and brackets are different than those you listed. I will list the correct items you need for this light. The grommet needed for this light is part # A54GB. The mounting bracket designed for this light is part # BK5557GB. The two-pin plug you need for this light is part # A46PB. Part # A57GB and part # BK55BB are designed for a 2-1/2 inch light and will not work with the 2 inch light you referenced.
    view full answer...
  • Red Beehive Marker And Clearance Light In 2-1/2 Inch Round
    The Beehive Side Marker and Clearance Light w/ Mounting Bracket, 1 Wire - Amber # MC21AS is the only light that comes with the bracket. If you want a red light in the same size, we have the Sealed LED, Beehive Trailer Clearance, Side Marker Light, 2-1/2" Diameter - Red # MCL23RB that can be flush mounted using # A55GB or recess mounted using # A57GB. If you want a recessed mount, you can use the Heavy-Duty Metal Mounting Bracket for 2-1/2" Round Clearance Lights # BK55BB for these lights...
    view full answer...
  • Can a 2-1/2 Inch Round Surface Mount Trailer Light be Mounted Using a Grommet Instead
    Technically you could use grommet # A57GB with trailer light # MC58RB. However the light was meant to be attached to a flat surface. The recessed mount version is # MC55RB and you would use grommet # A55GB. This set up actually costs a little less though the light requires pigtail # A46PB.
    view full answer...
  • Is GloLight LED Trailer Clearance or Side Marker Light P2 Rated
    I checked with Optronics and can confirm that the GloLight LED Trailer Clearance or Side Marker Light # MCL157RB is P2 rated. To mount this light you can use the 2-1/2" Round Grommet # A55GB for flush mount or 2-1/2" Round Grommet # A57GB for a recessed mount. It will require 2-Prong Plug # A46PB. The GloLight LED Trailer Clearance or Side Marker Light # MCL157RB is red although there is also an amber version of the exact same light at part # MCL157AB. I have added links to video reviews...
    view full answer...
  • Recommended Clearance Light And Grommet For Older Snowmobile Trailer Rebuild
    The clearance light I recommend for your snowmobile trailer is part # MCL57RB. This is a 3 diode 2-1/2 inch round light. It does require a rubber grommet for installation. The grommet to use for installing this light I recommend is part # A57GB. You may need to take a small round file and open the mounting hole you said measured about 2-5/8 inches but this should work well for your trailer. To connect the light to your trailer wiring I recommend using the Two Wire Pigtail, part # A46PB....
    view full answer...
  • Availability of Mounting Bracket for 2-1/2 Diameter Round Sealed Trailer Lights
    We do indeed have a bracket designed for 2-1/2 inch diameter trailer lights, part # BK55BB. You would also need the rubber grommet, part # A57GB. The bracket and grommet would work with a 2-1/2 inch diameter lamps like part # MC57RB or # MC57AB.
    view full answer...
  • Can the Optronics 2-1/2 Inch Flush Mount Trailer Light # MC57RB be Surface Mounted
    The Optronics 2-1/2 Inch Flush Mount Trailer Light, # MC57RB, requires a grommet and 2 wire plug, # A46PB, and is not designed to be surface mounted. The 2 wire plug would interfere from surface mounting the light. Instead, you could use the Heavy-Duty Metal Mounting Bracket, # BK55BB, and grommet, # A57GB. This mounting bracket will allow you to mount the light without having to drill a 3 inch hole in your trailer and the light will sit in the grommet securing it to the bracket. Another...
    view full answer...
  • Recessed Clearance Lights and Wiring For a Dump Trunk Bump Bed
    It sounds like you have three of the Optronics 2-1/2" LED Clearance Lights # MCL59RB held in place with the Rubber Grommet # A57GB and two of the Optronics 2" LED Trailer Clearance Lights # MCL55RB with the 2" Grommet # A54GB. If this is what you have all the lights use the 2-Wire Pigtail # A86PB and can be wired in using whatever length of wire is needed. We do have the Bonded 4 Wire # 16-4B-1 sold per foot that you can break into 2 wire strips for each side and connect using Butt Connectors...
    view full answer...
  • 2-1/2" Round Trailer Lights that are Recessed Mounted and Rubber Grommet for 2-3/4" Hole
    Yes, the Rubber Grommet for 2-1/2" Round Trailer Lights - Recessed Mount, # A57GB requires a 2-3/4" diameter cutout for installation and allows you to use a recessed mounted 2-1/2" diameter sealed light such as the LED Trailer Clearance or Side Marker Light, # MCL59AB or # MCL59RB.
    view full answer...
  • Is the Heavy Duty Light Bracket # BK55BB Compatible with Optroncs Glolights
    Yes, the Heavy-Duty Metal Mounting Bracket # BK55BB that you referenced would work with the Optronics Glolight Amber # MCL157AB or the Optronics Glolight Red # MCL157RB but you will need a grommet as well. For that you would want a Round Grommet # A57GB. For wiring up the lights you will want a Two Wire Pigtail for Sealed Trailer Clearance, Side Marker Lights # A46PB.
    view full answer...
  • Looking for Trailer Clearance Light to Fit 2-5/8 Inch Rough Opening
    I'd recommend the # MCL59RB for red or # MCL59AB for amber. The lamps are sealed and are waterproof, perfect for a snowmobile trailer. Each LED lamp is 2-1/2 inches in diameter. With the lamp, you'd use the # A57GB grommet, which requires a 2-25/32 inch hole, which is about .156 of an inch larger than the 2-5/8 inch hole you referenced. If your 2-5/8 inch measurement is right on the mark, it would take just a few moments with a Dremel or a round file to slightly enlarge the existing holes...
    view full answer...

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