So AHA!
Snap-on Dreanaught!
It came with three lug bolt legs for non-Fords, and a pair of arms that grip the groove in hub for Ford pulling. A big forged ring with setscrew prevents the Ford legs from spreading in use.
I bought mine years ago missing the ring, just recently scored the ring by dumb luck, and need to reunite them and test.
The part numbers of the S-o, forged into everything, is something sequential like 3456.