This is interesting, I have many GM Parts Books and this part seems to get the run around. I will try to explain what "I" Think is going on..

In ALL of the gm Lines this part fits 1976 2 door right Door, A, B, G & C Body Cars. My 1976 printing of my 1975 and older Cadillac Parts book states it is correct for all 1970 - 1975 2 door Cadillac Cars, all models for the RH door, in my Pontiac, Oldsmobile, Buick & Chevrolet Parts books there is a different part number listed, those Books have different Print dates. I think what is going on is that they had changed the plug for the 1976 cars so they changed the part number, BUT then they included this "Adapter Plug" (that is included with this sale) to adapt the 1976 Actuator to fit all the 1970 thru 1975 GM A, B, C & G Body Cars that have power Door Locks. I have tried to show the ends of the plug in my pictures. 

So if you can understand all that I have said,  what  I have is a Power Door Lock Actuator and Adapter (if Needed) that is boxed with the part number #9633788, Group 10.485, in the parts books it fits all 1976 Cadillacs, Pontiacs, Chevrolet, Buick and Oldsmobile A, B, C & G Body cars that are 2 door cars and it fits the right (Passenger side) door. And I am Guessing with the adapter it also fits 1970 thru 1975 GM Cars that are listed above. 

I hope the time I have invested to try to figure this one out is a help to you. Please check the pictues carefully to make sure my conclusions are correct and this is the part you need for your car.

The parts are in excellent NOS Condition, the actuator, adapter wire and the rubber boots on the actuator, None have ever been installed on a car.