DDkeWR

Hi all, I am new here, my name is David and I'm from Belgium, Europe. I have a 2000 WR400F which I would like to transform into a Supermotard and I am looking to buy some second hand wheels. I have been looking on http://www.yamaha-motor.com/sport/parts/home.aspx to compare different models and have found: Front hub compatible with: 1999-2000 WR400F 2001 WR426F Rear hub compatible with: 1999-2009 WR400, 426 and 450 Does anyone knows what is different on the front hubs of the other years? Or anyone knows for sure which models are completely compatible? Many thanks in advance! David