If you own an M5, M15, an M16, or a rare M17, you should also have the manuals for the 1949-56 2R-3R-E-2E trucks because the illustrations are better, the shop procedures are explained better, and you can see what parts you can use from the later trucks.
Downloadable Studebaker International catalog. If you want to spend a little time on a stormy night. Type truck in the search bar and click on the navagation arrows next to it. Easy way to see all the truck parts, decals, books and manuals that are available.
And of course Chuck Collins at Studebaker parts on-line