As far as I know, you can use any of the wheels of former models down to 2003 without modifications. On older wheels u can take out seals, bearings spacers and washers (the whole inside) and use the right ones for your 2012. I did this with spare wheels from a 2001 (I think) for my 2006 and it worked.
Of course there are companies with wheels for your bike or buy oem. I was lucky and found used ones