B190 Enthusiasts

I'm reinstalling the bench seat and am wondering if it is fixed to the floor or wood frame? Is this bolted through the floor? Finally are the seats belts bolted to the bench or the floor?

I'm trying to make is safe for a car seat if that's even legal. Otherwise I have to add an extra passenger seat. Thanks!

The seatbelts are bolted to large bolts that go clean through the metal floor in my '94. My benchseat was screwed to the wooden subfloor.