As Grigg said, bearings and seals are not hard to find as GM didn't reinvent the wheel for just that truck but used off the shelf parts from ones like Timken, Bower, or LMC. We have a 1928 Chevy dump truck that had no brakes at all on the front, just the backing plates Know a man with a 28 stake bed that let us copy the brake shoe steel backing ( they are NOT hard to make) and most important the cam/lever/pivot/rod of the mechanical brake set up. Summary is these old trucks are so simple that if you can't buy it you can make it.
[img]https://i.postimg.cc/QBh8R87S/IMG_4582.jpg[/img]
