-Notice the diamond shapes pressed into the running boards...maybe this is how 'diamond plate' got its name?
Model A Ford Pickups of that era had the same diamond style embossing on the running boards. They were hard to find way back when I had mine. I put passenger car running boards on it which had rubber mats over smooth steel.
Aridzona is the place to find rot-free trucks and cars. The OP should go buy that one for parts for his restoration. He's only two states away.