Need help identifying this spindle

Wait a minute here.
Your trying to tell me there are different diameter openings in rotors for hubs to fit into?
That's not true, and i would totally disagree with you on that.
You check Rock Auto, Bendix, Wagner, Centric, and there is only one aftermarket rotor sold for any 65-72 disc brake set up.
You know how many rotors that i have replaced on these brakes, in all the years that i have been rebuilding them, then putting them up for sale.
You may, or may not know my work in the for sale section on this forum.
Just sold the set up that i had advertised, this morning, as a matter of fact.
Didn't have any difficulties, pressing the studs into new rotors and the hubs, that i have ever bought, when exchanging new rotors, on any year hub.
Hubs fit any rotor.
What are you trying to tell me, (us) here about hubs, then?
I don't get it?