For street 3 point belts. Also, I'd only do 4 point belts if the vehicle had a GOOD roll bar. the kind that you are certain would keep your head from being crushed if you rolled... Not the OEM one. 3 point belts allow you to fall to the inside of the car in a rollover. Also they allow you to grab that paper that's about to blow out, or the coke can that's rolling around the passenger side floor board.