I've got the RJS and it works just fine. I've got a tab welded to my rollbar though so I can't help you out with the floor mount type. The lap belts attach to the stock locations and I used a j-clip to attach the submarine belt to the box-beam structure that the front seats bolt into.
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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team