Sub straps play an integral role in harness safety, especially in harnesses without ASM. If yours is frayed or has been compromised you need a new one. If you have a 4 point competition style harness with ASM and are looking to upgrade, the sub strap is the easiest way to satisfy most sanctioning bodies.
Dual subs can be converted to bolt in using a sub-strap bolt in kit. Comes with all necessary hardware for install including backing plates, eyebolts and washers.