Is Optronics LED Trailer Tail Light a Direct Replacement for 2018 Casita Lights
Updated 09/29/2025 | Published 05/14/2025
Question:
Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens Part Number: STL78RB Is this an exact replacement for a 2018 Casita?
asked by: Michael T
Expert Reply:
Hi Michael; lights can vary from model to model even within the same year so I can't say for sure if this is an exact replacement for your 2018 Casita. The best thing you can do is measure to see if the size matches. The # STL78RB is 7-9/16" long x 3-5/16" tall x 3/4" thick. If this matches the shape and dimensions you currently have you're all set. I went ahead and attached a picture below showing the dimensions, including the distance between mounting holes. Let me know if you need anything else.
(click to enlarge)
Product Page this Question was Asked From
Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens
- Trailer Lights
- Tail Lights
- Stop
- Tail
- Turn
- Oval
- Surface Mount
- Submersible Lights
- LED Light
- 6-1/2L x 2W Inch
- Red
- Optronics
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Video: Comprehensive Review: 16-14 Gauge Butt Connector
- Video: Optronics LED Trailer Tail Light: The Breakdown
- Shop: 16-14 Gauge Butt Connector - 5 Pack
- Shop: Hook Probe Circuit Tester
- Shop: Deka Heat Shrink Butt Connector - 12-10 Gauge - Nylon Insulation - Yellow - Qty 5
- Shop: Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens
- Q&A: Possible Causes for Dim Trailer Lights
- Q&A: 4-Pole Trailer Wiring Functions & Wiring Installation for Optronics Oval LED Trailer Light STL78RB
- Q&A: What Should the Voltage Output Be at the 4-Way Plug on Curt T-Connector Wiring Harness # 56016
- Q&A: Installation of Optronics Sealed, 6-1/2 Inch Oval LED Trailer Stop, Turn, and Tail Light
- Article: Trailer Wiring Diagrams
- Article: Trailer Lighting Requirements
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Gooseneck Hitch Recommendation for 2008 Chevy Silverado 3500HD Service Body
- Q&A: What Roof Rack do I Need for My 2021 Toyota 4Runner Off-Road Premium to Use Hullavator?
- Q&A: What Is The Difference Between Kenda AM10234 And KE88KV Tires?
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: How to Tell the Weight Rating of a Trailer Axle
- Article: Brake Controller Installation: Starting from Scratch
Robin H.
9/29/2025
Hey Michael, did you have a chance to measure your 2018 Casita's tail light to see if the dimensions match? I'm asking because your experience could help others with similar trailers.