Wheelhouse Panels: (from GMPartsDirect.com
under 'Catalog', 2000 Pontiac Bonneville, 'Body', 'Front Body', 'Wheelhouse Panel')...
Panel Assy, Frt Whlhse R 12482071
Panel Assy, Frt Whlhse L 12482072
Prices for the above 2: GM List $157.34 - GMPD.com $92.83
Panel, Frt Whlhse R 25697420
Panel, Frt Whlhse L 25697421
Prices for the above 2: GM List $109.60 - GMPD.com $64.67
I'm not sure which one is the one that you'll need. I would think that it would be the lower 2, but I'm not sure. I had to have the same things replaced on mine right after I bought it, but it was covered under the 90 day NYS lemon law warranty. Let me see if I can find the paperwork with the p/n'* on it.