[rotorwrench]

I can't speak for the 1952 F series but I can for the Mercury set ups that I am more familiar with. The special step shank bolts are no longer available unless you luck into some NOS parts from a collector/dealer. I use aircraft bolts with the correct size bushing to fit inside the mount bushings to set the clamp up tension. Washers are a large area type that can be sourced through special hardware sources or possibly McMaster Carr or the like. When I purchase used stuff, it is generally pretty well corroded so used is a hit or miss source. If from western dry states, the parts might still be good.