Brake and Clutch in Seattle gave me part # Raybestos H9226 but, they are no longer available. I did find a NOS set on Ebay when I put my 58 Viking 60 together a year ago.

It looks like RockAuto has that part # on a wholesaler closeout for just under 10$. I ordered 2, they have 2 left. Hopefully they are correct.

Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof