Replacement Brake and Red Side Marker Lights
Updated 12/29/2025 | Published 11/28/2025
Question:
Hello, I need to replace my rear brake lights in my trailer. They have this number on them: SAE IST 75 DOT 420-15 I also need to replace red side marker lights. They have this number on them: SAE LP P2 PC 84 Can you help me find the appropriate replacement parts?
asked by: Edward R
Expert Reply:
Hey, Edward.
SAE stands for the Society of Automotive Engineers. The SAE number you're seeing is not a part number for the light, it's just a number on the light/lens that means it passed SAE guidelines.
If you could reply to the email with picture's as well as get me some specs on the light, I'll be able to look at what we have and what would be the best replacement for both the brake light.
Look forward to hearing back from you!
Product Page this Question was Asked From
Peterson Trailer Tail Light - Stop, Turn, Tail - Incandescent - Round - Red Lens - Passenger Side
- Trailer Lights
- Tail Lights
- Stop
- Tail
- Turn
- Round
- Surface Mount
- Non-Submersible Lights
- Incandescent Light
- 3-3/4 Inch Diameter
- Red
- Peterson
more information >
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Gwendolyn Y.
12/29/2025
Hey Edward, did you get a chance to send over the pictures and specs for your trailer brake and side marker lights? Once you had those details, were you able to find replacements that matched up? Your update could make it easier for others trying to identify similar lights.