Anyone know the part number (or compatible part numbers) for one of these?

There are at least two compatible Delco Changers, with the 12-disc being the standard issue. Also be certain your car is pre-wired with the harness, and that the changer includes the bracket. Part numbers and details can be found in the Links/Parts section at the Yahoo! Catera Owners Group.

http://autos.groups.yahoo.com/group/CateraOwners/

can anyone identify the rims on that car in that link above?

Disregard above post....they are factory rims correct?

Those are the 17 inch special wheels you get on the 2000-2001 Catera when you get the sport option.