Rotary Racer 10 Research
I found a harness on Amazon that offers 4-6 points by SUNDELY: it's quite low-cost at £43.99, although there's only one review so we can't be sure of it's quality. It seems very similar to the LUKE harness we currently use in RR9: comes in a choice of red, black and blue!
Red: https://www.amazon.co.uk/SUNDELY%C2%AE-Colour-Point-Racing-Harness/dp/B01ABR4G42
Black: https://www.amazon.co.uk/SUNDELY%C2%AE-Colour-Racing-Harness-Release-Black/dp/B01E0ZO75Y
Blue: https://www.amazon.co.uk/SUNDELY%C2%AE-Colour-Racing-Harness-Release/dp/B01ENRLXGA
Also see www.willians.com for FIA-standard 6-point harnesses!
- TA
NOTE: Unfortunately all of these sales below have ended, so are unavailable!
http://www.ebay.co.uk/itm/6-Point-Racing-Performance-Safety-Harness-Camlock-JDM-Racing-Seat-Belts-BLUE-/321909796703?hash=item4af351af5f:g:iwQAAOSwo6lWN6C
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6 Point Racing Performance Safety Harness Camlock JDM Racing Seat Belts.