A web search turned up a number of choices available (none of these are mine) for the 1950 GMC 150 model front outer wheel bearings (majority of info indicates these are same as the Chevy 3600 bearings):
LMC Truck Part# 34-0501
Classicparts Part# 73-051
Rock Auto has multiple front outer bearings listed under several manufacturer names. Centric Part# 41162012E is listed as standard "ball bearing" style replacement outer bearing set (need 2 if you are replacing both sides).
NOTE: Before checking the other replacement bearings listed on rockauto.com, recommend you closely measure your existing bearings and races as the dimensions on the replacement bearings listed differ from one brand or part number to another.
Good luck and let us know how your search comes out!
