Part 6 Floor Pan Replacement 1965 Mustang Restoration Floor pan replacement for this 1965 Mustang restoration, is one of the most common tasks faced by Classic Mustang owners and restorers. Like most classic cars, the Ford Mustang had great sheet metal and lousy rust proofing. Ford seemed more intent on sealing spot weld seams for immediate water proofing of the interior than on preventing long term rust damage. Download Regatta De Blanc The Police Rare. Classic Car Rust If you own any other classic muscle cars, you'll also know the drill. The Camaro, 55 Chevy, Chevelle, Charger and others all share the same fate at some time or other, a need for floor pan replacement. (And you thought the dealer installed undercoating was just an unnecessary profit taker)!