Need to know what parts interchange between a 1966 Catalina and 1966 LeMans/GTO. Are items like wiring harnesses, heater blower and heater core, the radio, wiper motor the same for both body types?

Any parts interchange books on these and other pontiac cars from 1964 to 1967?

Need to know what parts interchange between a 1966 Catalina and 1966 LeMans/GTO. Are items like wiring harnesses, heater blower and heater core, the radio, wiper motor the same for both body types?

Any parts interchange books on these and other pontiac cars from 1964 to 1967?

Very few items interchange between a & b body.

Harness's are different
Radio is different
heater core is different
heater control switch is different
A Master parts book would help you tremendously with determining interchange on most items. You can try to find a used one or you can purchase one from PY on disk. email if interested.