A common issue in rallying.... hitting trees sideways. A way to set up the seats better is to run 2 smaller tubes sideways across the floor for the seat to bolt to. Weld the outer ends to a sill tube preferably, or the rocker if no sill bar is installed; put the other ends through slightly larger 'slip' tubes welded to/through the tunnel. In that way, the the seat can move inward a bit if you have a hard sideways hit that crushes in the side bar, sill bar, and rocker on the driver's side.