Debbie,

You should have just bought a new headunit. The 2000/2001 stock AP1 radios are terrible. I'm glad you were able to find it though.

 

Theres a few places the small 6 digit number sticker can be. One is in either of the 2 gloves compartments... mine is in the bottom, not the top.

Another place is to check under the hood on the fuse box/lid/cover... if you checked all these spots and you don't have the card/user manual, you would need to go to the dealership.

edit: whoops.. noticed you already went. nm