I am restoring a 1967 Tempest Custom convertible. I am having trouble finding seat upholstery. I have a bench seat with an armrest and headrests. When I ordered upholstery from OPGI, it came with no headrests and the pattern was wrong. Mainly, it installed totally different. It fit over the seat back like a sock. The original upholstery had an open back with plastic brackets that fit over the openings in the back. Then there was a plastic cover that attaches to the rear to cover the mounting hole. OPGI thought it was a '68 seat. The pattern was very close but it still fit like a sock. When I removed the seat cushion, there was a build card under it with a VIN code that matches the VIN of the car. Anyone have any idea what style of seat I have and how to get sear upholstery for it?