I have just removed the AC system and heater box and duct work from my 1967 GTO with factory air. I have a new actuator diaphram forn the outside heater box, but can not find actuators for the inside heater box. (one is on the top of the box and one is on the bottom left side of the box. They appear to be the same. Some companies show an actuator diaphram far a 68 that looks the same in the catalog. (Year One Has This) Will this work on both diaphrams on the inside box on my 1967 GTO? Thanks