Any idea what this is or fits?

I don't know for sure. I was under the impression that is what they were, and "I always thought" it was the same outfit that GM used on early transmissions, although I've heard them referred to as as a Muncie shifter.

That old Falcon I had, actually a Falcon Ranchero, needed work, and I didn't have it for long. It actually belonged to my little brother, who died in a crash when I was in the Navy. Somebody, not he, had installed some big tall stiff front coils and I could never get the damn thing to "stay on the road." I couldn't unload it fast enough. Summer of '74