hi john
marlin supply a bar that goes between the two upper seat mountings(normal seat belt mountings) on the role cage . the top strap is a one piece strap that goes around the bar and goes to both shoulder straps.
I was bit unsure about this with the sva but mark told me it is ok but as far as I know no one has put a car through a sva in this set up.
all the best
tony
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