Power steering pulley diameter question

The pulleys do not interchange between brands.
I dont like the Federal pumps.The few Ive had are too slow. They seem to crap out on fast left /right maneuvers, overheating the oil and puking it out, and losing boost at the most inopportune times. The Saginaw seems to keep up ok.
I had to bother the parts guys at my local parts house to let me browse through the catalog to find a pressure hose to connect the Saginaw to my 71 360 with a 73 box, on a 70 K, in a 68 Bcuda. Found one that fit. Didnt record the PN.