How is this search for a fix going? I’m in the same boat you guys are in. My 47 AD 3100 has the original mounts but are toast. My cab was still setting on what I think may be the original rubber. The front corners are just some maybe 1/4” rubber pads. That would be easy to make. The rear of the cabs rubber stabilizer cushions are there but have separated from the metal brackets. I’m thinking of plating the inside and underside of the cab and using axle bump stops.
The center mount is still together. I have no idea for changing the rubber in that one. I’d sure like a good idea if you have one.
Second question is the front mount on the cross member. The manual shows what looks like a spring in the center of the mount bracket (K). My radiator support to cross member was setting on a small rubber cushion, no spring in the center. Am I missing something or is that just a bolt and not a spring?