how to put 20 inch rims on
Any good local tire and wheel shop should be able to help you with this, or visit a site like www.discounttires.com and ask a question of their sales department. They can get you into the wheels and tires that will fit your vehicle.
Search Pontiac Bonneville Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Bonneville Experts