You looking for the same ones? I found this:
Lakeshore Wheel and Tire: Buy OEM, Chrome, alloy wheels online! - chrome wheels, chrome rims,used,alloy,factory,hubcaps
If you just put in 2005 Pontiac, then put in Bonneville and 18" wheels.
They should come up. They're listed as $151 a wheel coming to $604 for a set. I've looked at the site and I'm not completely sure if they're repaired/refinished wheels, or just replicas... I think they might be replicas but I don't know since the site isn't too intuitive. Has anyone else ordered anything from Lakeshore Wheels & Tire? Is there anything good/bad about factory replicas or repairs/refinishes that would be useful to know?