The seat back has a steel bracket just by your outside shoulder that ties the seat to the door pillar. Both right and left side. On mine, I needed to move the seat back 2.5 inches as I'm 6 foot 4 inches tall. I made a Z bracket to replace the original bracket. Worked out nicely. There is plenty of legroom in the backseat area so it doesn't bother the passengers when I have them.