Factory Original Bench Seat needed a good amount of work to rebuild as covers and cushions were in a bad state.
Cushion part number C5Z-655410-B K-49
Check out my previous posting on building up a Rare Bench Seat for a mustang.
http://1965convertiblemustang.blogspot.co.nz/2013/08/1965-ford-mustang-front-bench-seat-and.html