Anyone know if stock 9 wheels will fit on a 10 ? I've read conflicting posts regarding certain 17's...

17's don't fit unless they are extra special. The front calipers on the X are bigger.

Define "extra special"

custom made. Like the 16" CCW's buschur runs on his RS over the factory brembos.

If you look at the pic above, you will see that as the rim gets closer to the spokes, the rim curves in towards the hub; therefore allowing less space to fit the 13.8in Brembos. Some 17in wheel designs curve less than the factory Evo IX wheels; thus allowing them to fit over the larger Evo X brakes.

I'm wondering if those 1" wheel spacer kits would do the trick to use just about any 17" wheel?