Well, ask and ye shall find -
2000 - 05 Bonneville installation kit
Wiring harness adapter
If you were to buy from Crutchfield, they should provide these things to you without charge.
However, last night as I was surfing through and looking at some Crutchfield head units, my Pronto Shopping Messenger told me "it could be cheaper over here - " There are other online stores that sell Crutchfield'* products for about 40% less.
Crutchfield does, however, provide excellent support forever, great installation diagrams, wiring harness adapters, and everything else you could want.
I've bought several replacement car stereos from them and always installed them in GM cars. They're great.
Just so you know, this thread has me thinking about replacing MY GXP'* stereo now. See what you've gone and done?
I'm thinking, though, of the Pioneer DEH-P47DH. Steering wheel controls, CD changer, XM etc. I'd lose some display functionality, but I'd get three outputs for front, rear and subwoofer amps, an iPod controller, etc. Pretty inexpensive, too. I have a bunch of Polk speakers picked up - I had some in my 95 GTP and thought they were awesome.
Anyone ever examine this unit and such?
Oh, if you want to check out the Pioneer DEH-P47DH, click here: