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

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

Part Number: MC38RB
In Stock
$3.10
Retail:$16.33
You Save: 81%
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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 etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MC38RB

Highlights

  • One Light, Two Uses: Works as a clearance or side marker light for flexible setup options.
  • Built-In Reflex Reflector: Eliminates need for separate reflector to meet visibility rules.
  • Tough and Simple Build: Durable ABS housing with red snap-on lens stands up to road use.
  • Quick Surface Mount: 1-wire design grounds through hardware; no extra wiring needed.
  • Road Legal Lighting: DOT compliant and P2 rated for a 90° beam spread.
  • Exact Replacement Fit: Matches Uni-Bond #ML2042R, Truck Lite #26304R, Grote #46702, Peterson #108WR.

Features to know about

Simple Visibility Upgrade: Red Incandescent Clearance and Side Marker Light

This 4" x 2-1/16" oval trailer light makes it easy to add or replace your clearance or side marker lighting. It runs a 194 incandescent bulb behind a red snap-on lens and is compatible with 12V DC systems. The P2 rating provides a 90-degree beam spread—bright enough to be seen straight on for solid visibility when mounted as either a clearance or side marker light.

No Extra Reflectors Needed: Built-In Reflex Reflector

You won’t have to worry about adding a separate reflector. The built-in reflex reflector is molded right into the lens, saving time and keeping your setup clean while still meeting DOT standards. It’s one less piece to mount, but you still get the reflectivity required for nighttime safety.

Tough Enough for Everyday Use: Durable ABS Housing

The housing is made from durable ABS plastic that resists cracking and wear from road vibration and the elements. It’s designed for surface mounting, with a depth of 1-3/16" and hardware spacing of 3" center to center, so it sits solidly wherever you install it.

Straightforward Installation: Single-Wire Ground System

Installation is quick with the single-wire setup that grounds through the mounting hardware—no complicated wiring needed. Just connect power, secure the light, and you’re ready to go. Hardware isn’t included, so you can choose fasteners that match your trailer build.

Reliable Replacement Fit: Cross-Compatible Design

If you’re swapping out an older light, this one lines up exactly with several common models—it replaces Uni Bond #ML2042R, Truck Lite #26304R, Grote #46702, and Peterson #108WR. That means your existing holes and wiring can stay right where they are for a clean, direct fit upgrade.

Specs

Dimensions

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

Dimensional diagram of Optronics MC38RB red oval trailer clearance or side marker light showing overall length, height, depth, and mounting hole spacing.

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

Electrical and Bulb Specifications

  • Bulb type: 194
  • Voltage: 12V DC electrical systems

Warranty

  • Warranty: 3-Year warranty

Manufacturer Cross Reference

  • Uni Bond #: ML2042R
  • Truck Lite #: 26304R
  • Grote #: 46702
  • Peterson #: 108WR

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

Alternate part number: MC-38RB





Customer Satisfaction Score:

Ratings & Reviews

4.9

4120 reviews
5 Stars
(3689)
4 Stars
(333)
3 Stars
(53)
2 Stars
(17)
1 Star
(28)
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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.

by:

Needed to replace broken factory units. These are a very good match and work well.



by:

Looks good, I Will install this weekend, Quick shipping also.



by:

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.



by:

The service I have gotten from you has been awesome. I wish all companies operated this well on processing and shipping the customers' orders .



by:

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



by:

Fast shipping. Great price. Ideal replacement lights.



by:

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



by:

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!



by:

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



by:

These connectors are great trailer wiring connections.



by:

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.



by:

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



by:

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



by:

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!



by:

Bought 2 but couldn't get one to work. Didn't want to pay shipping for just the one light.



by:

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



by:

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.



by:

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.



by:

Just a replacement clearance light. The light was easy to install and works great.
This is my 3rd purchase from etrailer.com, 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,



by:

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!!



by:

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

Phil C. profile picture

Phil C.

5/26/2018

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.



by:

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



by:

Good customer service and communication.



by:

Direct replacement for legacy lights



by:

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.


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See what our Experts say about this Optronics Trailer Lights

  • 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.
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    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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    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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    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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Info for this part was:

Employee Patrick B
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Patrick B
Employee Dustin K
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Employee Laura H
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Laura H
Employee Wilson B
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Employee Brian T
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Brian T
Employee Noah M
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