Try here:
http://www.napaonline.com/Search/Re...k=Interchange%20Number&Nty=1&N=0

That failing give Geoff a call at Alretta:
508-788-9409 his prefered method of contact.
http://www.alretta.com/

Geoff is a brake encyclopedia, he called out part numbers for the wheel cylinders on my '52 GMC 450 from memory. I caught him out of the shop when I first called, simply amazing!


1947, 1950, & 1952 Chevrolet 1/2 ton
1952 GMC 450 series Cab Over Engine
1946 Chevrolet 2 Ton