Cab Mounts Question

[BigA]

I have a question on cab mounts. I know the front bolts go through the floor but what about the rear mounts. Do they just screw in from the bottom with out any nuts that go inside the cab like the front. And should I be able to remove the radiator core support bolts without any problems. My truck is 71 chevy longbed 1/2 ton, Any help will be greatfull, Thanks, Richard.