I have some parts for sale out on EBay.
The R3 4.7 has now been completely discontinued by Mazda Japan now but a good one is available on this link.
https://www.ebay.co.uk/itm/255633794842 ... SwqZhi09r3
The other ratio is a 4.3 which is the same Ratio as the Spirit R uses. I had in my own 231 Road car and believe this was the ratio Mazda should have used. It made 1st gear properly usable and dropped the revs by 500 revs in 6th --------------it made the car so much nicer to drive :mrgreen:
https://www.ebay.co.uk/itm/255633821669 ... Sw~m1i3A-Y
4.7 now sold