There is a diagram and measurements in the IVA manual.
A piece of wood 153mm long by 43 mm high placed on the seat pushed to touch the backrest, measure from the top front edge of the block straight up 450mm the draw a line horizontal back to the seat belt mounts on the roll bar, the mounts should bet at this height or higher.
For IVA don't put the straps through the seat run them round it.
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