Actually, Napa has all kinds of stuff listed online for bigger trucks. If you go on their site, click add vehicle, at the top of that popup, choose "other vehicle types" and choose medium/heavy and go from there. They show wheel cylinder kits for the rear, but I don't see the cylinders. (UP37
RockAuto has the wheel cylinders also WK37


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