OK well I took a chance and followed the instructions from someone online who did this to a 2002 and even though the wires arent the same color, it worked great!

So, just so it gets documented in Google land:

I pulled the Delco radio from a 2000 Pontiac Bonneville SSEi with tape and single CD ...

I've been digging around for a couple days online and I can't seem to find a good answer to simply wiring an aux input cable directly into the stock Delco radio HU? I prefer to use a $5 headphone cable rather than buy a $70 ipod interface box if possible.

Seems I should be able to splice into the ...