This is the same pressure rotor and shaft assembly used in our Formula Ford 5-Port Side-Mounted Dry Sump Pump (Part No. 167-01-Side).
It is designed for use with a 1" wide scavenge rotor, but you can shorten the shaft for use in a pump with a 7/8" scavenge rotor. Pressure rotor is 5/8" wide. You must drill the shaft to accept your drive gear cross pin.
Shaft diameter: 1/2"
Shaft length: 5 5/32"
Rotor OD: 1 19/32"