I currently have an aftermarket radio wired directly into the car and bypassing the ribbon cable connector
is there an antenna adapter i can get for this or does it come with the harness adapter, or is it something i can get relatively easily?

the adapter you want is actually made for Volkswagons. Best Buy might carry it? I bought mine online for $10.
http://www.tune-town.com/Cars/stuff/...ile_Aurora.htm
Don't quote me on this just yet. I need to install my cd player yet then I'll confirm for sure that this will fit. If it fits my car, it'll also fit your Bonneville.

Here are some closeups of the adapter I bought. I'll let you know if it works for me like I said.

OK, SWEET, im getting tired of not having a radio and listening to the same cds all the time, even with the mp3 cds they get boring... let me know how it goes.

ok, the antenna adapter works perfectly!

awesome, you can ignore the Q on auroraclub

Oh so we're not good enough for you huh.
had to go and ask another forum

actually, he posted pics and progress of it on the aurora club forum and i asked him there if it worked out before i check this thread... but im sorry if i offended you gumball...