jounce bumpers that are on the rear of these cars are not available from gm and guess what nowhere else either. I ended up finding a set on a 94 camaro that was wrecked to get the car capable of getting a safety inspection done. I had the rear brake rotors checked and thought that they would pass no problem but guess what they tell me need new ones because the old ones are to close to the throw away limit not there yet but close. Found out that new ones are just over 30 over throw away when new