upper harness mount position

[Shorty]

Does anyone know how to line up the upper harness mounts in relation to the seat position?
I've seen the part of iva that states the minimum hight of the mounts but I'm also trying to figure out the width of the mounts.
I have the cross bar ready to drill and weld bushes in but just want to check on perfect position.
That's assuming my roll bar and seats are ok.
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