05-06 will fit on the 03, but the rotors on the 03 are 300mm, and the stock 06 are 310 i beleive, so u could use them, just with spacers, could use older srad or tl or busa wheels, but need smaller spacers as the fork spacing on tl and busa i believe is 7mm wider then the 1000
there is lots of other wheels, but those are the easiest to do