I don't know if I could reach through the tail light. The loose bolt is the one closest to the rear seat.
I don't mind grinding the old bolt off if necessary, but how would I fit a new bolt in facing up towards the cabin if I can't access the opening from the bottom of the Jeep? If I put a nut on the inside, the sub wouldn't fit perfectly either.
Could I put in a new rivet or nutsert? If so, how would I get the new piece to attach to the body and not spin too?