They exist,
Wheels - ROTA Grid (15, 16, 17, 18, 19 inch) Wheels | ROTA Wheels Australia
Pictures - 18×8.5 Rota Grid | WHEELDUDE.COM (the 9.5's will give you another 18mm poke on top of this)

You can't get Grid-r's in that size, If it were me, I would just ignore the advice everyone has given (they are likely just jealous of the mad fitment you will have), buy the 9.5's that don't fit, then when they look rediculous sell them off at a loss just to make sure