Ok. Dumb question but im going to ask anyways. Does anyone know if tail lights for a 99 will fit my 1988 k1500. Thank you

 

The GMT400 series covers 1988 to 1998, and is a single body style. The 1999 year saw a change to the "new" body style (GMT800), and the lights are likely NOT compatible with a 1988 truck.

For what its worth, I've replaced the tail lights on my 1996 fairly inexpensively with lights I found on Amazon that were for the specific year model.

 

Maybe it is worth to invest in Retrobright LEDs, they are available for '88 K1500.

 

There are tons of lights on Amazon that fit 1988-1998 trucks. Here's a cheap example, at $43 for a pair of tail light assemblies:


Now, if I could just find seat foam or covers for my 1996 Cheyenne with the 60/40 split front seat that easy....