Right now I have the stock cassette player in the car. I was wondering if all 2000 Pontiac Cd players would work in my car.

not sure here i think that the CD player uses the ribbon cable not sure about the cass. if you pull out the factory radio pull it out and see what kind of connection it has. if it has a regular harness then any Pontiac radio will work. if it has a ribbon cable then you need one that had the ribbon connection

I hope that wasnt confusing