Wow, that's an unusual request, wondering if the on/off markings on 76 rear window defogger bezel are like dots like a 74 or arrows like a 77.
But I more than I understand I have my own strange requests, and appreciate all the help people give me!
I checked the parts catalogs, and the first thing I needed to remember is that it is a "defogger", not a "defroster". And the defogger requires an adapter package, and the adapter package contains the part number of the panel bezel.
It looks like the 74 is unique, and 75-77 are the same.