I figured LMC truck or Blue Oval would be your best bet. Blue Oval is running 15% off right now. I'm glad to hear you got them though. I feel your pain with not being able to find parts.. I have an F-250, and although the cab is the same as the F100, the bed is impossible to find.. And the bed is the only thing I need.. I think I've lost hair during this project
In my opinion, the 51-52 is the nicest looking, then the 55, then the 56, then the 53, then the 48-50, then the 54

I'd like to see your ride!