FWIW, 66 seats are a lot different - quite a bit more narrow (so a coffin console fits between them) and have a hard plastic back and the tracks are different in that the mounting studs through the floor are closer together front to back and side to side as well. Your seats WILL fit a 66 once new mounting holes are drilled and a 66-up console will not be used. I am using 66 Barracuda seats in my 65 wagon along with a 68 B Body buddy seat since the seats are narrow enough to allow use of the buddy seat. Good luck with the sale!