I own a '99 Oldsmobile Silhouette GL and cannot find any website or talk to any technician who can tell me what the part # is of the Rear Cargo Door Glass. Can someone point me in the right direction? Tried GM Good Wrench site - called tech - no idea - just want to charge $350 plus more for install. Ebay? None. Quarter glass, passenger door glass, windshields and mirror glass only. What's worse is that Oldsmobile has been out of production for a decade now. Please help me out!!!