We do offer a Class II hitches that will fit your 2004 Pontiac Grand Prix, but the ground clearance on these hitches will be less than your current hitch. The chances of contact with your driveway would be higher.
An option that you may consider would be to use a trunk mounted bike rack. If you are only using the hitch for carrying your bikes, then the trunk mounted hitch will remove the issue of contact with your driveway.
A trunk mounted rack that I recommend that is a confirmed fit... view full answer...
Yes, you can get just the replacement hardware for the Draw-Tite Trailer Hitch, # 24659, to install on the 2001 Pontiac Grand Prix. You will need Replacement Hardware Kit for Trailer Hitches, # RHK. On the product page, insert the hitch number, 24659, in the first box under shipping special. Click the Add to Cart button and that is all you need to do.
I have included a link to the installation details for the hitch and a video showing a typical installation to help you when you re-install... view full answer...