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Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Red Lens

Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Red Lens

Item # MC38RB
Our Price: $3.53
Trailer Lights
Shipping Weight: 0.09 lbs
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4" x 2-1/16" Oval. Incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 1-Wire design. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Red Lens part number MC38RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (89)
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Optronics Trailer Lights - MC38RB

  • Clearance Lights
  • Oval
  • Incandescent Light
  • Red
  • 4L x 2-1/16W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Non-Submersible Lights
  • Optronics

4" x 2-1/16" Oval. Incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 1-Wire design. P2 rated.


  • Oval trailer light functions as either a side marker or clearance light when properly mounted
  • Built-in reflex reflector removes the need for a separate reflector
  • Incandescent bulb can be easily replaced
  • Durable ABS plastic base
  • Red snap-on lens over incandescent bulb
  • Compatible with 12V DC electrical systems
  • Surface mount on trailer - hardware not included
  • Single wire design grounds through mounting hardware
  • DOT compliant
  • P2 rated


  • Overall dimensions: 4" long x 2-1/16" tall x 1-3/16" deep
  • Distance between mounting holes (center on center): 3"
  • Bulb type: 194
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # ML2042R
Truck Lite # 26304R
Grote # 46702
Peterson # 108WR

Optronics MC38 Series Incandescent Red Marker Clearance Light Dimensions

P2-Rated Lights

Diagram of light spread for P2 rated light

A P2-rated light produces a 45-degree angle of light to either side of its centerline for a total of 90 degrees of coverage. This beam pattern can be seen straight on, but it cannot be seen clearly from the side. So this type of light can be used as either a side marker light or a clearance light, but it cannot function as both. If you need both functions, then you must install 2 separate lights on your trailer - one as a front or rear clearance light and one as a side marker light.

MC38RB Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Red Lens - P2 Rated

Alternate part number: MC-38RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Red Lens - MC38RB

Average Customer Rating:  4.9 out of 5 stars   (89 Customer Reviews)

4" x 2-1/16" Oval. Incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 1-Wire design. P2 rated.


Bought some LED tail/turn lights, license plate, and side marker lights, and they work great and the price was right. Replacing the lousy shin-killing original ones that used to stick out from the sides of the trailer and the flimsy plastic plate mount. Etrailer is the best as usual.


Works great, great price.



Lights still working well, although we dont use the camper a lot. It sits more than it goes.

Etrailer Expert

Mike L.


@James We're glad your # MC38RB trailer clearance light is still doing the job for you.


Great price, easy to install, and works as it should !!!!! Thank you !!


The products I bought form etrailer are superior to what I replaced on my 1988 stock trailer. The clearance lights both red and amber have a good grounding and 12v supply lugs. Solid lugs for positive connections unlike the old two piece units where the ground and positive connection fails between two cheap movable parts.
I'm very happy with the quality and construction of these lights.
I also ordered the 3 diode ID light bar looks good and works good.
On line ordering is fast and easy and delivery was three days to the west coast which is greatly appreciated thank you everyone at etrailer you do a superb job!!


just as advertised, worked right out of the box, easy to connect, no issues.


I appreciate the professionalism and integrity of the people at etrailer. In a recent order I placed I was delayed in thoroughly checking the contents of my order. I was still well within the 60 days. When I did look through the box I discovered I had not received an item. I'm thankful the company believed me and sent me the parts I had not received. I recommend etrailer and will shop with them again.


Exact replacement for existing clearance lights on my trailer, 1 wire with attachment point being the ground point. Ordering was easy and shipping was quick. Great supplier of trailer parts.


Just a replacement clearance light. The light was easy to install and works great.
This is my 3rd purchase from, and I have been very happy with each purchase. If there was anything to complain about, it would be that the shipping for this little clearance light cost almost double what the light itself cost,


High quality marker light at a great price and the shipping is FAST. etrailer is a great place to shop.

Phil C.


Everything is going good. At times I feel as though the tail lights could be a bit brighter but they do the job and at a great price. Thanks for checking up.


I couldn't find these for my old camper in local parts stores. They were perfect fit and replaced the old parts perfectly. Work great. Thanks E-trailer!


Just a great place to work with. They have tons of parts for trailers not made any more. Keeps my trailer in tip top working order. Fast shipping and excellent value


These are the exact lights needed for our renovation of our 1970 Kit Camper trailer. Thanks so much and for the excellent service in shipping them so FAST! I can't wait to finish this project and these lights will be perfect.


I ordered this light and also some taillights. I had to amend my order and they were very helpful in doing that. Items arrive quickly and were of very high quality. Highly recommend them!


My old side marker lights were in bad shape so need replaced. Purchased some extra ones for down the road.


Purchased trailer lights to replace old ones. These arrived in a few days, even with the economy shipping and were exactly what I wanted.


These connectors are great trailer wiring connections.


excellent products, etrailer has the parts I need. These light are even better built then the old ones.


Installation went great! I am the most satisfied with how quick the shipping was and customer service was the best! I will be using these guys for all my trailer part needs


delivery was fast & the running lights I ordered are for my vintage 1971 Lance camper. They are a great match to the originals.


I haven't installed the new exterior lights yet, but I have to say that I'm pleased with the service to date.


The products I received are exactly as represented on the website. They appear to be of the high quality that I have come to expect from e-trailer. I have ordered numerous things from them over the years and these were shipped promptly and received in a short period of time as is always the case when I order from e-trailer.


does what's on the tin, make sure you put ground on the one a screw goes through or you might have a bad time.


Lights were delivered in a timely manner & was able to replace the damaged light on our rv, looks great!!


Lights are good quality. Just what I needed to replace on my aging horse trailer.


Replaced two of the existing clearance lights on a cargo trailer. Easy to install and worked great.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Finding the Correct Replacement Tail Light Lens for a 2004 Fleetwood Sequoia Pop Up Camper
    You will need to pull a light housing and look for any identification that will tell you the manufacturer and model number. With that information I can determine if there is a replacement that will fit. Otherwise you will have to go by the measurements. Lens # A38RB that you referenced fits light # MC38RB. This light measures 4 inches long, 2-1/16 inches tall, and 1-5/32 inches deep. The # A32RB that you have already tried will fit light # MC32RB which measures 4 inches long, 2 inches...
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  • How to Find Replacement Lens for Trailer Identification Light Bar
    The numbers you provided indicate that the lens meets DOT requirements, but it's unfortunately not a unique number that will help us identify the lamp in order to find a replacement lens. Many manufacturers print, stamp or sticker the number of the lamp somewhere on its housing. If you could find THAT number, it would likely help in finding your lens. If you could reply with a part number for the lamp or a photo (which would be really helpful), I'd be happy to check into it further for...
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    Image 1 for
  • Red and Amber Clearance Replacement Lights for Signal Strat 77-557
    From what I could find online it looks like your Signal Stat 77-557 side markers are 4 x 2. We have some options from Optronics for you that have replacement bulbs and lens available. For Amber # MC38AB - Replacement Lens is # A38AB For Red # MC38RB - Replacement Lens is # A38RB They both use the same replacement light bulb which can be found on our site using part # A194B.
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  • Finding Replacement Lens for Command SAE-AP2-91 Light on Jayco Camper
    The SAE number found on the existing lens for your Jayco popup camper refers to the lens/light rating and not to the actual part number. I recommend measuring the dimensions of the clearance light you have and then try to find the best possible match for a replacement lens. The Bargman Clearance Light Replacement Lens # 34-59-010 referenced in your question is 4 inches in length x 2 inches wide x 5/8 inches in height. For an oval shape with similar dimensions, I recommend looking at the...
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  • Are 4" Oval Peterson and Optronics Clearance Lights the Same Dimensions
    They are not the exact same shape but they basically have the same dimensions with the differences being within 1/16" of each other (which could be the difference between manufacturer's preference for measurements). For the amber version of the Peterson Light # 423000 you need part # 422800 and for the red version of the Optronics Light # MC38AB you need part # MC38RB. Either way thought these lights are interchangeable with each other.
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  • Replacement Multi-Purpose Locking T-Handle
    Yes, we do have locking t-handles. I recommend the Bauer Products T-Handle Lock for Truck Caps item # BA47VR. This t-handle is 3-1/2" long x 2" wide, the length of shaft is 2", and the distance between mounting holes center to center is 1-1/2".
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  • Replacement Lens for Peterson Trailer Light 106R
    I pulled up pictures of the Peterson Light part 106R and was able to determine that the part # 108-15R would fit it as a replacement lens. For an Optronics equivalent for the entire light you would need the part # MC38RB.
    view full answer...
  • Replacement Lens for Peterson F108WA Lights
    Yes, the Replacement Lens for Peterson F108WA Lights is offered in both red part # 108-15R and amber part # 108-15A. For the complete assembly you will want to use the Oval Trailer Clearance, Side Marker Light with Reflector part # MC38RB for red and part # MC38AB for amber. I have attached a review and installation video of these lights for you.
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  • Replacement Red Reflector Lens For Rear Running Light That Measures 3-3/4 X 1-3/4
    The closest we can come to this size is the Replacement Red Lens for Peterson Oval Clearance or Side Marker Light w/ Reflector, part # 108-15R. This replacement lens measures 3-3/4" wide X 1-5/8" tall. I cannot guarantee this replacement lens will fit your rear running light that measures 3-3/4" wide X 1-3/4" tall. You can always replace the entire light with the Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Red Lens, part # MC38RB. I have included...
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  • Most Popular Replacement Clearance/Marker Lights for an Old Travel Trailer
    The most popular clearance/marker lights we offer are the Optronics Clearance or Side Marker Lights w/ Reflex Reflector. These are offered in both incandescent part # MC38AB for amber or part # MC38RB for red and LED part # MCL31AB for amber or part # MCL31RB for red. They have a two wire design so they are super easy to install. The white wire gets grounded and then the back wire goes to the running light circuit with butt connectors part # DW05744-5. If you need screws to attach the light...
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  • One Wire Clearance and Side Marker Light Options to Replace Lights on Horton Hauler Trailer
    We have quite a few different options for trailer clearance lights with one wire and that will ground through the mounting hardware. These lights come in various sizes and shapes. The best replacement for your trailer will depend on the size light you are wanting to replace. For a small LED clearance light that is a stud-mount, you can use the Optronics Sealed Mini Rectangular LED Stud Mount Trailer Clearance Light. For an amber light you will want # MCL95AB and for a red light # MCL95RB....
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  • Replacement Marker Lights for 1997 Sundowner Horse Trailer
    If you are looking to replace the entire marker light, I have located lights that will work as an exact replacements for the PM-108-15. Oval Side Marker Light with Reflector - Red, # MC38RB Oval Side Marker Light with Reflector - Amber, # MC38AB These marker lights have one bulb. If you are just needing the replacement lens, the red lens is part # 108-15R and amber lens, # 108-15A.
    view full answer...
  • Option For 4 Inch Red & Amber Clearance Marker Lights w/ 3 Inches Between Mounting Holes
    The only option for 4" oval clearance marker lights with 3" between mounting holes are indeed LEDs, and there is no reason you can't replace all your lights with LEDs - it will work just fine. As for the clearance lights, what you need are the following: - Red: Piranha LED Trailer Clearance or Side Marker Light # PE74QV - Amber: Piranha LED Trailer Clearance or Side Marker Light # PE64QV I have also added a link below to our entire selection of LED lights if you do decide to replace...
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Info for this part was:

Employee Patrick B
Video Edited:
Patrick B
Employee Dustin K
Video Edited:
Dustin K
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Noah M
Updated by:
Noah M

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