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Optronics Clearance or Side Marker Trailer Light - Incandescent - Oblong - Red Lens
Optronics

Optronics Clearance or Side Marker Trailer Light - Incandescent - Oblong - Red Lens

Part Number: MC68RB
In Stock
$2.94
Trailer Lights
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3-1/2" x 1-1/8". Incandescent trailer light serves as a clearance or side marker light when properly mounted. Snap-on lens. Durable ABS housing. Surface mount to trailer - hardware not included. 1-Wire design. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics Clearance or Side Marker Trailer Light - Incandescent - Oblong - Red Lens part number MC68RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MC68RB

Highlights

  • Simple, Compact Lighting: 3-1/2" x 1-1/8" size fits tight spots for clearance or side marking.
  • Quick Mount Setup: Surface mounts with 2-3/4" hole spacing for easy swap-outs.
  • DOT Approved: Marked on the lens so you stay compliant on public roads.
  • Reliable Seal: Included gasket keeps moisture out for a weather-tight fit.
  • Easy Upkeep: Snap-on red lens and replaceable incandescent bulb simplify maintenance.
  • Proven Compatibility: Matches Truck Lite #26338R, Grote #45252, and Peterson #M136R.

Features to know about

Reliable Replacement for Worn-Out Lights: Direct-Fit Incandescent Design

When old clearance lights crack, corrode, or stop working, this Optronics oblong light steps in as a clean, dependable replacement. Measuring 3-1/2" long x 1-1/8" wide x 1" thick, it’s compact yet bright enough to serve as a clearance or side marker light when properly mounted. The single incandescent bulb runs on 12V DC power and draws just 0.2 amps at 12.8V, giving you the same look and performance as classic trailer lighting without having to change wiring or mounting setups.

Simple Setup for Quick Repairs: Surface-Mount with 1-Wire Connection

For jobs where you just need it to work, this light keeps things straightforward. The surface-mount design attaches directly to your trailer without cutting large holes or adding brackets. Its single-wire setup grounds through the mounting hardware, so hookup is quick and clean. You can have it swapped out and working again in minutes—no rewiring or extra parts needed.

Built Tough for Everyday Use: ABS Housing and Snap-On Lens

You don’t need to baby this light. The housing is made from durable ABS plastic that stands up to vibration and daily wear. A red snap-on lens protects the bulb but still lets you easily replace it when the time comes. The included gasket creates a weathertight seal that helps block dust and moisture from getting inside, keeping your light working longer in all kinds of conditions.

Road-Ready Visibility and Compliance: P2-Rated and D.O.T. Approved

For drivers who care about visibility and staying within code, this light checks both boxes. It’s P2-rated for a focused 90-degree beam pattern—perfect for use as either a clearance or side marker light when positioned correctly—and D.O.T. approved right on the lens. That means you get reliable illumination that meets safety standards every time you hit the road.

Specs

Dimensions

  • Overall dimensions: 3-1/2" long x 1-1/8" wide x 1" thick
  • Distance between mounting holes (center on center): 2-3/4"

Technical diagram of Optronics MC68RB red oblong clearance or side marker trailer light showing measurements and mounting hole spacing.

Electrical

  • Bulb type: incandescent
  • Power draw at 12.8V: 0.2 amps

Warranty

  • Warranty: 3-Year warranty

MC68RB Optronics Clearance or Side Marker Trailer Light - Incandescent - Oblong - Red Lens - P2 Rated

Alternate part number: MC-68RB





Customer Satisfaction Score:

Ratings & Reviews

4.9

2594 reviews
5 Stars
(2358)
4 Stars
(179)
3 Stars
(32)
2 Stars
(10)
1 Star
(15)
Review sort icon
3-1/2" x 1-1/8". Incandescent trailer light serves as a clearance or side marker light when properly mounted. Snap-on lens. Durable ABS housing. Surface mount to trailer - hardware not included. 1-Wire design. P2 rated.

by:

Great product and super fast shipping.
These
guys are great.



by:

Fast shipping nice lights.



by:

excellent web ordering fast shipping, good quality parts



by:

clearance lights were nice



by:

really like these compared to my old lights. 24 ft shadowmaster enclosed trailer



by:

Running-light assembly was easy to install & fit nicely against the fiberglass panel. Good product, great price, & the seller was extremely helpful & courteous to me when the order didn't show up as scheduled. Highly recommended!!



by:

Great lights at a very good price. I have always been happy with my purchases from etrailer. Plan on buying other items.



by:

I have to go to a hardware store to search for mounting screws.



by:

Very good selection, quick shipment, good product. I will definitely use etrailer for all my trailer needs.



by:

Everything ordered was received very quickly. All items purchased were true to fit. Would definitely purchase additional items from etrailer and highly recommend them.



by:

Everything arrived promptly just as I had been informed and in great condition. Have had great experience with etrailer oN multiple occasions and will continue to look to you for your exceptional customer support in the future. Thanks agaiN for your help!



by:

Everything I have ever purchased from e trailer has been excellent. I have called ahead to see if the had a part in stock so i could pick it up and everyone I have talked too was great to deal with I would recommend them



by:

Exactly as described.



by:

I am restoring a 1969 Bethany Citation, and want to keep it as close to original as possible. These lights are the closest thing I have found. They fit the trailer perfectly and I feel much safer knowing I don't have to worry about 45 year old parts! Delivery was right on time and installation was a snap! I have already created my wish list for what to buy next!



by:

Good product, good price. Nice replacement for my broken Roadtrek marker lights. Easy to install.



by:

Completely happy with my purchase. The follow with instructions was also very helpful. The entire process from ordering to final installation was a good experience. I would recommend etrailer.com to all my friends.
Mason Bowman



by:

The product selection is great! Easy to navigate their site. Products arrived very quickly... like the next day! I found what I needed to repair hail-damaged marker lights on my 2010 enclosed trailer. I highly recommend etrailer



by:

great customer service, they knew exactly what I wanted.



by:

I have these lights on some of my trucks. They are simple and work well. I had purchased them locally but the store stopped stocking them. Tried etrailer and they had them at a good price with reasonable shipping costs. Had them in about 3 days!



by:

My mobility scooter accidentally ripped off the loading light on my Harmar lift. Thankfully, I found out this Optronics marker light is identical to the one I destroyed! I ordered the light immediately and received it from etrailer in a few days. The light arrived well packed, protected and as described. Installation was a snap and the light works as designed. Yes, I am one happy customer!



by:

Perfect replacement lights for my boat trailer. Very fast delivery . Would highly recommend this company !!!

Earl profile picture

Earl

5/26/2016

Pleased with the lights . They are still working perfectly.



by:

Fit in place of the OEM lights on a Sure-Trac trailer...Looked high and low for these and found them here at etrailer :-)

Randy H. profile picture

Randy H.

5/5/2015

The lights matched my old ones perfectly!



by:

As a returning customer, I am pleased with your product's and service. The red and amber clearance lights are for my 1967 MCI Greyhound bus RV conversion.



by:

It was an exact match to what I needed to replace. I thought I was looking for a needle in a haystack and found exactly the needle I needed. Thank you!!



by:

As per your request here is a photo of the installation of the running lights that I purchased from etrailer. I have included a photo of the original light fixtures that I replaced. The originals were proprietary to Winnebago Industries, but have not been available for some time. The top piece that the lights mount on are made of a plastic material & was molded to accept the fixtures into a small recessed area. As a consequence, I could find no replacements at the local suppliers. I found the MC68RB fixtures on your web site & felt sure that they would fit the recessed area. They did fit, & I was able to install them with some common sense adjustments to the new fixture & the area that received the fixture:

1 added another wire to provide ground for the light.

2 drilled a hole to accommodate the wires in the center of area to receive the fixture, as the original hole was set to one side.

3 mounting holes were wider than new fixture - used one of the original holes & used a self drilling screw on the other.

We are happy with the installation, and in our opinion there is very little difference in appearance of the area between original & replacement provided by your company. There are at least 2 models (View & Nation) that used the original, global-bright 122R/122Y, sold between 2005 & 20013 from what I can tell.
I no longer have the good camera that took the photo of the original photo. The photo of the replacement fixtures was taken by a smart phone, hence, less quality of photo. Sorry the quality is so poor.


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See what our Experts say about this Optronics Trailer Lights

  • Replacement Trailer Clearance Lights for GloBrite 122r/122y
    The globrite 122 in red or yellow/amber are 3.75 inches by 1.70 inches from what I can find online. We do not have a direct replacement, however the closest dimension we have to replace them is 3-1/2 by 1 inch. I recommend the # MC68RB and # MC68AB. If you want to go larger, then I recommend the 4x 1-1/2 inch LED # MCL17RB and # MCL17AB.
    view full answer...
    Image 1 for
  • Replacement Lens for Glo-Brite 122R and 122Y
    I do have an option but Glo-Brite is no longer in business so you won't be able to get any replacement parts for these lights such as lenses. The only option you have would be a full replacement for which the most similar option we offer is the Optronics Clearance or Side Marker Trailer Light part # MC68RB for red or part # MC68AB for yellow.
    view full answer...
  • Replacement Taillight Solution for GLO-BRITE 122R/122Y of Trailer
    I do have an option but Glo-Brite is no longer in business so you aren't able to get replacement parts for their lights. The only option you have would be a full replacement for which the most similar option we offer is the Optronics Clearance or Side Marker Trailer Light part # MC68RB for red or part # MC68AB for yellow.
    view full answer...
  • Replacement Red and Amber RV/Trailer Lights For Glo Brite 122x-88 Lights
    With the Glo Brite 122 series lights being obsolete we have found the Optronics Clearance or Side Marker Trailer Light in Amber # MC68AB or Red # MC68RB are the best replacement option.
    view full answer...
  • Replacement Trailer Clearance Lights for GloBrite 122r/122y
    The globrite 122 in red or yellow/amber are 3.75 inches by 1.70 inches from what I can find online. We do not have a direct replacement, however the closest dimension we have to replace them is 3-1/2 by 1 inch. I recommend the # MC68RB and # MC68AB. If you want to go larger, then I recommend the 4x 1-1/2 inch LED # MCL17RB and # MCL17AB.
    view full answer...
    Image 1 for
  • Replacement Lens Recommendation for a Light Stamped SAE P2 93
    The Replacement Lens part # A68RB that you referenced measures 3-1/2 inches long by 1-1/8 inches tall. If the lens you are looking to replace matches these dimensions then this would work for you. The part number for the light this lens is designed for is # MC68RB.
    view full answer...
  • Recommended Replacement for Glo-Brite 122R and 122Y Lights
    We have lights that are similar to the Glo-Brite 122R and 122Y lights but not exact replacements. I recommend the Optronics Clearance or Side Marker Trailer Light - Incandescent - Oblong - Red Lens # MC68RB and Amber Lens # MC68AB which are 3-1/2" long x 1-1/8" wide x 1" thick. I have added links to reviews of these lights for you to take a look at.
    view full answer...
  • Mounting Hole Spacing For Side Marker/Clearance Lights MC68 and MC44
    The Optronics Clearance or Side Marker Trailer Light # MC68AB and # MC68RB have a mounting hole spacing of 2-3/4" for the hole centers and are centered horizontally and vertically in the mounting plate. The Trailer Clearance or Side Marker Light w/ Reflector # MC44AB and # MC44RB have a mounting hole spacing of 3" for the hole centers and are centered horizontally and vertically in the mounting plate.
    view full answer...
    Image 1 for Image 2 for
  • Replacement Red and Amber Lights for a Older DZ 77-825
    Hey Elaine. It looks like the DZ 77-825 lights measure 3-1/2" long x 1 3/8" wide. There's not much information about them online and there's no modern recommended replacement for them. The closest lights I have to those dimensions are the Optronics Clearance or Side Marker Trailer Light item # MC68AB in amber and item # MC68RB with a red lens. They measure 3-1/2" long x 1-1/8" wide x 1" thick and have mounting holes spaced 2-3/4" apart on center. These lights are sold individually and...
    view full answer...
  • Recommended Replacement Clearance Lights In Place Of Glo-Brite 122R/122Y OEM Light
    I do have a solution for you, however Glo-Brite is no longer in business and subsequently their parts are no longer available, unfortunately. Instead, what you can use instead is the Optronics Clearance or Side Marker Trailer Light - Incandescent # MC68AB. This light measures 3-1/2" long, 1-2/8" wide, 1" thick, and is made from a durable ABS plastic. Additionally, we do also have the same light available with a red lens # MC68RB if you ever should need it. Attached are a couple of...
    view full answer...
  • Is the Optronics Clearance or Side Marker Trailer Light LED or Incandescent
    The Optronics Clearance or Side Marker Trailer Light # MC68RB you referenced is an incandescent trailer light with a bulb. It is a surface mounted light that is 3-1/2" long x 1-1/8" wide x 1" thick; I have added a link to a video review of this light for you to check out as well. The replacement lens for this light is the Replacement Red Lens # A68RB.
    view full answer...
    Image 1 for
  • Availability of Replacement Red Lenses for Light Bar On Utility Trailer
    The closest individual light we have to the measurement you provided is the Optronics Oblong Trailer Clearance Light # MC68RB. This light measures 3-1/2 inches x 1-1/8 inches. However, the lens for this light is not reflective. The replacement lens for this light is part # A68RB. If you are looking to replace the entire light bar, you may like the Peterson Thin-Line Red Identification Light Bar # 136-3R. The lights on this light bar are comparable to the Optronics # MC68RB lights. These...
    view full answer...
  • Replacement Red Light Cover Needed for 3-Bulb Clearance Light Bar
    So the number that you referenced has more to do with the tests performed on the light/lens, but I still think we have a solution for you with the Replacement Red Lens # A68RB. This is a replacement for the Optronics Clearance or Side Marker Trailer Light # MC68RB which measures 3-1/2" long x 1-1/8" wide x 1" thick. If this matches what you have then this lens should work, otherwise the only other solution we have for you would be to replace your whole like bar with something like the clearance...
    view full answer...
    Image 1 for
  • Troubleshooting Replacement Glow-Brite 122R/122Y Bulbs
    We don't carry that manufacturer and some online research indicates they may no longer be in business which if that is the case would be why. With no markings and no way to physically test the bulb for fit, all I can offer is a replacement. Have you pulled the bulb out and looked around the base for markings? The closest dimension we have to replace them is 3-1/2 by 1 inch so I strongly recommend the # MC68RB and # MC68AB as replacement options that will work well.
    view full answer...
  • Dimension Of The Replacement Red Lens for MC68RB and MC69RB
    The dimension of the Replacement Red Lens for MC68RB and MC69RB, # A68RB, you referenced is 3-12 inches by 1-1/8 inches. This is probably the closest fit you will find for your replacement lens. If you need the entire light assembly to ensure the proper fit, I suggest the Oblong Trailer Clearance, Side Marker Light, 1 Wire - Red, # MC68RB.
    view full answer...
  • Solution for Needing Replacement Bulb for Optronics Light MC68RB
    I checked with Optronics and the # MC68RB does not have a replaceable bulb, but considering it's relative low cost it would make the most sense to just replace the entire assembly.
    view full answer...
  • Is Clearance Light # MC68RB D.O.T. Approved
    If you look closely at the lens in the picture I attached you can see D.O.T. stamped on the on the front of it indicating that it is D.O.T. approved.
    view full answer...
    Image 1 for

Do you have a question about this Trailer Light?


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Cole B
Installed by:
Cole B

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