Hey everyone. Recently we dug up a mint condition Thread rolling head from about 20 years ago in our warehouse. I want to use it on an upcoming project but am having some difficulty locating the correct sized rollers.This is the only markings on it at all. I searched and ordered a set of rollers but the ID of the rollers are way too big for the head.

Acme-FETTE Thread Rolling Head
N-3
7/16 - 7/8
M12 - M22

2Deg. 0'
Low Helix

The Cleveland Twist Drill Co.
Made in U.S.A.