body bushings

I have 2 87 b2200s, one i bought with factory tilt wheel problem is it had front end damage and im using the other truck ( sagging frame) to replace the core support but every mazda I ever removed the 2 frame horn bolts with castle nuts and cotter pins just snap off. Replaceing the bolts will be easy but has anyone ever purchased the rubber bushing, also found out when cutting rust out of the good trucks floor boards the donor has a different style pan? any help would be greatly appreciated.

The last tme I priced them from the dealer they were $50 each! I just made my own after hearing that BS