seat belt bolts stripped

I am in the process of finishing my floor and getting prepared to install the sound deadening and carpet I just bought. I removed the driver side seat belts with no issue, but the passenger side just keeps spinning. I can see the bolt is spinning and not the nut. WTF? Im certain I can cut the center bolt off and get it removed but how do i get the door side out without destroying the belt housing or the floor since the bolt goes into the body cavity below the door?????
Author: swisherred