When I did the fender cracks, I added more metal to the bolt on braces attached to the radiator support. The 50 I had, had more original fender support then the 54 had, but some of the stuff from the 54 may have been removed before it came to me. My 54 had some history with a few guys that were drag racing, some stuff may have been removed to lighten the truck.
My 50 took almost 10 years to crack the fender corners. Gene