HERE IS A PAIR OF NEW MOTOR MOUNTS FOR YOUR 1966 THUNDERBIRD   WITH A 390 428  CUBIC INCH ENGINE AND C6 TRANSMISSION

• FITS LEFT OR RIGHT SIDE.
•  The way to make sure you have a C6 transmission is to check the VIN plate. Above the last item on the plate which reads Trans it is either a 4 or an 8. If it is a 4 you have a C6 transmission and you are ordering the correct motor mounts.