I've been adapting a Sno-Blade to Alice. The blade had no 'Shoes' (or 'Feet'). So I set about to make some. First off was the part to the blade. 2" centers there. Then the angle that plate sets at. Figured that out then went about figuring what I wanted for ground contact. Had some thick Nylon type material. Found some large round washers and built from there.
The threaded rod is 3/4". That should stand up to some abuse.