The seat mounts DO NOT hold the seat in the car. For Christ sakes, Pro-Mods and similar have the damn seats held in with dzus fasteners. You think those keep the seat in the car in the event of a crash? The BELTS hold you AND the seat in the car. If your belts let you and the seat move around a lot in the event of a crash......either the belts are not mounted correctly OR you did not have them tight enough