Turns out I have to change my tune.
The one on top matches the one in the transmission I am rebuilding. The one on the bottom is the later model, I believe. All of my spare transmission parts except for the one seem to be the early 5 speed variety. i.e. 1974.
Somebody else warned earlier that the 1975 trans should or may have early parts. I seem to have more early parts than later and I don't seem to have any late model forks. Don't seem to have any spare forks for that mater.
I'll continue looking through my junk and see what I can learn. (wonder where all the shifting forks went?)