Got my harnesses installed (I know the track nazis are going to tell me this is unsafe) using my OEM seat. I just wanted to show it's possible. I have the shoulder straps under the carpet to the cross member of the frame. Welded an i-Bolt and attached the shoulder harnesses mounts. The bottoms I removed seat and track and installed a universal mounting bar from Sparco and connected the lap straps down! Very comfy and locked up the brakes a few times to see. Definitely going to need some comfort pads but it does it's job and doesn't slide or let me go anywhere. Feels a lot more assuring. Bonus: it looks cool