I did some custom work on the interior of my '84 Monte SS several years ago. The upper trim panels are from an '87-'88 Olds Cutlass, reupholstered by a local trim shop, with a newer Monte exterior emblem (2001-2002). The lower trim panels are from a Buick regal (same as the original Monte lower panels), but with the Concert II speaker covers. The front seats are from a '96-'98 Pontiac Grand Am GT, reupholstered to match the Monte interior.