It depends on how they mount. You may need to weld a harness bar to keep the shoulder mounts where they need to be so you don't crush your spine in a rollover. Also, DD with racing harness can be a pain. On my Mustang I left the stock belts to use on the street and only used the Schroth harnesses when on the autoX course.
1990 Jeep YJ 4.2
Howell EFI, BDS 3.5" lift, M.O.R.E 5/8" Boomerang shackles, 1" Daystar BL, 1" JKS MML, TFI, Crager soft 8s w 35" Dunlop Mud Rovers, Ford 8.8, 4.88s, Dana 30 E-Locker, Terra Flex SYE, Tom Woods CV shaft, Warn M8000.