I'm wanting to reupholster the rear seat with black vinyl. is there a cover I can buy so the upholstery shop can just recover the seat?
You can buy a rear cover from fmc56...... He makes them and they can be made in the original design... And you can install the seat cover your self.
I'd say just get some estimates from some trim shops to do the seat. I bought new 71 Mustang seat covers for mine and had a shop do my rear seat to match and it was cheaper than buying a set of covers. They just sewed lines in the vinyl to mimic the design of the frt seats.