That depends how you want to do it. I know what you are talking about but by having the harness bar just to offset the belt would be a waste of money.
When you get your harness set up get the warp around type so you can actually use the harness bar. It also provides structural strength to the body of the car.
When you get your harness set up get the warp around type so you can actually use the harness bar. It also provides structural strength to the body of the car.