For 1989-1991 Chevrolet R3500 License Light Bulb API 92815WKYT 1990

For 1988-1991 GMC R3500 License Light Bulb API 46885RQXH 1989 1990

API ProTune License Light Bulb fits Chevy R3500 1989-1991 28BQSJ

API ProTune License Light Bulb fits Chevy R3500 1989-1991 68BBDM

API 62DR73J License Light Bulb Fits 1988-1991 GMC R3500

For 1987 GMC R3500 License Light Bulb API 83835BGZD

API 73DD34P Back Up Light Bulb Fits 1989 Chevy R3500

API ProTune License Light Bulb fits GMC R3500 1988-1991 23KVZY