A good Ford parts person should be able to tell you exactly the application. The C6AB prefix of the part number points to a 1966 application. (C='60s, 6= 66 first model year used, A usually means passenger, B is for the exact app. Center number means it is a seat. Suffix is also special app) I worked Ford parts in the '60s and once learned, the numbering system made sense and really has been handy over the years.

I was going to say Thunderbird as well. Most likely standard Thunderbird seats from either 1965 to 1967 (somewhere in that vintage).