I believe you are looking for the crankshaft pulley. I've attached the page from the 73-79 master parts book.
For a 1976 2.3L engine with air, I believe you are looking for D42E6312-BA, D42E6312-BC, D42E6312-BD, D42E6A312-CA, or D4FZ-6A312-D
I've sent you a private message about a possible source.