saturn vue factory problem

I have been driving a 04 Saturn Vue for the past 3 years and I finally decided to change vehicles. I had installed a Kenwwod deck in the saturn when I got it and set aside the factory cd player unit. I went to remove my gear today and install the factory saturn radio when I ran into a problem. The plug on the factory harness isn't the correct one to plug into the radio. The vehicle side is the larger one peice GM style while the one for the radio is a small looking one like from an aftermarket deck. I don't remember having an adapter harness but it has been a long time. Please help as I need to get this resolved soon!!! Thanks for any help.

If you didn't buy an adapter you have to buy a reverse harness and wire that up. Sucks you didn't pay the extra $20 then, doesn't it?

I know the factory system worked before but I don't remember an adapter being used. I did use a wiring adapter as I always due with the aftermarket radios I install.