I really want some seats with headrests but I'm looking for the cheapest(price wise) way to do it. A guy working at Dallas Mustang told my father that 71 seats will fit the holes in a 66 and they should work fine. Is this true or has anyone done this? What are some other suggestions...i've sean the procar seats and the headrests that are made for the 66 seats, but I want seats that wont just fall forward...i want ones that lock in position.