I wanted to install an aftermarket cd player into my 2000 catera, but I can't seem to find a wire harness for it. I can only find 97-99 wire harness. Is it even possible to install an aftermarket cd-player into a 2000 catera?

Do you have the BOSE system? If so it will be tricky but it can be done.

Nope, I need to know where i can find a wire harness.

All i can find is 97-99 .... it may just work. You could call up this website and ask if they know anything. Ive seen 2000's with custom head units and I got quoted to have one installed once (never did yet).

http://www.tune-town.com/wire/1997-99_Cadillac_Catera_NOVA702001_MET712001.htm