My 81 has rear seat headrests. It was optional that year. You will definitely need a donor back seat. It will have all the brackets, supports, etc. Also, the back seat headrests are at a different angle that the front. It really does add to the back seat to have them, or at least I think so.

Good luck!

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R Talley
88 BMW E32 735i (make it go away)
95 Volvo 960 "Inga" (valve problems)
95 Nissan Maxima (the indestructible)
89 Ford Ranger XLT (ugliest truck in the South)