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Square Trailer Clearance, Side Marker Light with Reflector - Red

Square Trailer Clearance, Side Marker Light with Reflector - Red

Item # MC36RB
Our Price: $4.49
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Shipping Weight: 0.09 lbs
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2-3/4" L x 2-1/8" W x 1" D; Reflectorized lens; corrosion resistant; replaceable lens and bulb; mount on stud; 1-wire; 1-bulb incandescent Great Prices for the best trailer lights from Optronics. Square Trailer Clearance, Side Marker Light with Reflector - Red part number MC36RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (45)
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  • Videos (1)
  • Photos

Optronics Trailer Lights - MC36RB

  • Clearance Lights
  • Rectangle
  • Incandescent Light
  • Red
  • 2-3/4L x 2-1/8W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Non-Submersible Lights
  • Optronics

2-3/4" L x 2-1/8" W x 1" D; Reflectorized lens; corrosion resistant; replaceable lens and bulb; mount on stud; 1-wire; 1-bulb incandescent

Square Trailer Clearance and Side Marker Light with Reflector - Red

This square light can be used as a clearance or side marker light. The red lens is reflectorized, meaning that a separate reflector is not needed for DOT compliance. The light measures 2-3/4" long x 2-1/8" wide x 1" deep. The molded plastic housing and durable lens provide all-weather protection against corrosion. The light features a replaceable, screw-down lens and easy-to-replace bulb. The light contains a single lead wire for power and is grounded through the mounting stud.

  • Red, square light functions as clearance, side marker light
  • Reflectorized lens is DOT compliant, eliminating need for separate reflector
  • Weather and corrosion resistant
  • Single-wire design grounds through the mounting stud
  • Dimensions: 2-3/4" L x 2-1/8" W x 1" D
  • Replaceable lens and bulb

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # MR2020R
Wesbar # 3103
Peterson # 114R

Manufacturer Specifications

Square clearance or side marker light with a reflectorized lens, eliminating the need for a separate reflector to meet DOT requirements. Single-wire design grounds through mounting stud. Features replaceable lens and easy to change replaceable bulb. All-weather, molded plastic housing and durable lens to protect against corrosion.

dimensions of light

MC36RB Red Square Reflector Marker, Clearance Light by Optronics, Inc.

Alternate part number: MC-36RB

California residents: click here

Video of Square Trailer Clearance, Side Marker Light with Reflector - Red

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

Video Transcript for Review of Optronics Trailer Lights - Clearance Lights - MC36RB

Hello everybody, this is Jeff at Today, we're gonna take a look at this Optronics Red Square Trailer and Clearance Side Marker Light with the Reflector. Now, this red square light can be used as a clearance or a side marker light, and also the red lens used on this as reflectorized, meaning that our separate reflector is not needed for DOT compliance. The measurements on this light, just to give you an idea of the length, two and three quarter inches long, the width two and one eighth inches wide, and the depth of it is only one inch deep. Now, this light does feature replaceable screw down lens and an easy to replace incandescent bulb. If you notice in the back, it has a single lead wire for power, and it grounds through the mounting stud.

Now, I do wanna hook this up to some 12-volt power, just to show you how bright the light is. So we're gonna go ahead and take our power wire, and we'll go ahead and hook that up to the single wire lead. And as we mentioned, we're gonna ground it through the stud back here. So with it all hooked up, we'll go ahead and turn our power on, and you'll be able to see the light come on. And then I'm gonna go ahead and turn off the overhead light, and you can see the incandescent bulb lit up, shows you how bright the light is.

Go ahead and turn back on our overhead lights. Go ahead and turn off our power. Now, there's a molded plastic housing and a nice durable lens, which provides all-weather protection against corrosion. Now, on the manufacturer's cross reference, this slide will work as an exact replacement for the Uni Bond, part number MR2020R, the Wesbar, part number 3103, and the Peterson, part number 114R. But that should do it for the review on this Optronics Red Square Trailer and Clearance Side Marker Light with the Reflector.


Customer Satisfaction Score:

Customer Reviews

Square Trailer Clearance, Side Marker Light with Reflector - Red - MC36RB

Average Customer Rating:  4.8 out of 5 stars   (45 Customer Reviews)

2-3/4" L x 2-1/8" W x 1" D; Reflectorized lens; corrosion resistant; replaceable lens and bulb; mount on stud; 1-wire; 1-bulb incandescent


The only lights that will fit on our trailer. Glad you have them in stock!



Working great - just have a problem with people crushing them when they load the trailer with their big tractor tires


Product was exactly as described and replaced broken one perfectly. Item was shipped and received in very good time.I would recommend this company (E-trailer ) for any of your trailer lights you may be looking to buy!Thank you for a great product and great service! Thank You


The red ones are really hard to find..... very reasonably priced, super fast shipping. Website easy to use/simple to order. Excellent customer service. EVERY product I have ordered from these people has 110% quality and exactly as described ant see the red ones on the back in the picture,sorry.


Great lights at a great price. Actually I should have ordered the amber lights for the front corner of my trailer instead. However, I went ahead an ordered the whole trailer light kit anyway and use these red lights for the middle of the trailer since it's a long trailer. The lights themselves are well constructed and water tight. They are very visible at night and even have a built in reflector. Mounting was easy with one bolt to attach to the trailer so it makes it easy to replace if needed. As always, very satisfied with etrailer since I have been doing business with them for many years and always get high quality parts at a competitive price. I will share my photo when all my lights are installed.


Easy ordering! Fast shipping! Product as described! Would definitely buy from etrailer again!


Exactly as displayed. Neatly packaged. Price is lower than stores yet better quality. Delivered earlier than expected. I Used 6 (3 on each side) to make brake and tail lights for my trailer. Our forklift drivers kept breaking the bulky, hanging from the side of trailer, regular taillights purchased at retailers which used to cause so many problems. This practically eliminated the problem. Lights cant get caught where they are at and are almost flush to the trailer.


I didn't buy a trailer why are you sending me emails


Good value and fast updated service


Clearance lights look and work great they added the extra touch I wanted for my trailer

To L.


Lights still working great


Great store to deal with. My order was shipped immediately and lots of Email sent from order to shipping information. Order was shipped the same day it was received. I will be back to order my new tires and wheels at some point this year.


Good light that matches my existing


Very happy with the tail light covers I received. They were the right fit and arrived quickly. Would buy again from etrailer anytime.


The Product was as Advertised. It was just what I needed for my Flatbed Trailer.
The service on this order was GREAT. Thank You!
Great Follow-up and informative.


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!


Just as advertised


I got the exact replacement lights I needed for my trailer. Arrived on time. Good customer service!


The marker lights were exactly what I was looking for. The shipping was prompt and everything arrived in excellent condition.


Exactly what I needed, and will need again, and again.....for my boat trailer (which apparently has a "hit me" sign on it)


Very happy with the trailer light bought from eTrailer, fast shipment and great product!


Quick shipping and the lights look great. Haven't installed yet.

Thanks for your help.


Seems to be a nice unit. Shipping was slower than expected with no tracking info available. May have been a USPS issue as far as time in as much package stamped "damaged when received".

Jay S.


Well actually I sold the trailer that I originally bought them for. But I had ordered extra and they will fit new trailer just fine. A very nice product for the price.


perfect replacement for oem lights on trailer at a much better price


Perfect match to the Amber lights I purchased earlier!


Factory replacement on my Kauffman open trailer. Easy install and work as expected.


These lights are nice for the money , They fit my trailer perfectly. And I received them in very good time , Packaging was very good also.

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See what our Experts say about this Optronics Trailer Lights

Info for this part was:

Employee Patrick B
Video Edited:
Patrick B
Employee Jeff D
Installed by:
Jeff D
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 Noah M
Updated by:
Noah M

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