Thanks for the reference back to the IVA manual, but that was where I started. All I could find in Section 19 is
Note3:Seat belt anchorage points must comply with the strength and location requirements of Directive 76/115 EEC, or to an equivalent safety standard...
I worked through the directive, and as far as I can tell the upper mounts have to be between 543 and 1003mm from the base of the seat. That means the standard position of 100mm up on the roll bar is well within the allowed range with the seats I'm using, and will still be OK even if if I raise them by 20-30mm or so
Matt
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