Apols for the hijack but I'm looking to get JR23s on mine too. Scratching my head on set up though.
Where did you get to with yours?
F: 17x8 (et35) / R: 18×9.5 (et40)
or 18x8 (et35) / 18x8.5 (et?)
Would this work and if so what tyres?