A bit of planning and a bit of ignorance combined. Wanted high back buckets, stripped a pair of '71s not knowing they were essentially ill-designed orphans (The metal cracks where the seat bottom frame meets the seat back) but loved the fabric's color combination because it matched the custom...
I own a 1968 Mercury Cougar but have seat frames from a 71 Mustang wearing '72 upholstery as seen in the Ford Mustang Sprint, patriot package for Olympic Games.