[Tx Firefighter]

Rear cab mount bolts just screw into the cab. There is a nut welded into the floor for it to screw into.

Core support bolts are sometimes tricky. Even here in Texas, home of rust free trucks, they are usually rusty. The rust combined with it being a carriage bolt usually adds up to having to cut it off.

Any decent hardware store will have the bolts and nuts in stock if your are too bad to reuse. I always get brand new grade 8 stuff with new washers and nuts. It kind of like a little mini-Christmas present to myself...from myself.