The cab marker lights are firs for:
1988-1999 GMC Chevy C1500 1992-1999 GMC C1500 Suburban
1988-2000 GMC Chevy C2500 1992-1999 GMC C2500 Suburban
1988-2000 GMC Chevy C3500 1992-1994 GMC C3500HD
1996-2002 GMC C3500HD 1992-1999 GMC K1500 Suburban
1988-1999 GMC Chevy K1500 1992-1999 GMC K2500 Suburban
1988-2000 GMC Chevy K2500 1988-2000 GMC Chevy K3500

Specifications
Color: Smoke Lens Amber LED
LED Type: 5-5050-SMD LED High Power
Hole Distance: 4"
Part Number: 11516638 15599040 15691885 264159BK
DOT approved.
Covers are made of high quality ABS plastic, won't fade from exposure
Direct replacement for OEM factory stock cab marker covers. Perfect fit No leakage.
Faster on/off response time and vibration resistant.
High performance LED, long lifespan, superior illumination stability.

Installation:
Plug-N-Play: Come with T10 plug socket, convenient for modifying & rewiring.
Super Easy to Wire: Black to Ground and Red to Positive.(Instruction is not included)
For the non-installed vehicles, you may need to drill holes for installation.
If the LED won't light up, simply flip it 180 degrees. (reverse the polarity)

Package included:
5 x Cover with Base Housing, 5 x 5050-SMD LED Bulb, 1 x Switch Harness Wiring Kit

Warranty:
2 YEARS WARRANTY. Please contact us through the Amazon Messaging System. We'll offer return/refund/exchanges