I've creased the rad shrouds on my '03 WR450 more times than I would like to count. While checking Acerbis part numbers in the TT store, I found that shrouds for an '03 YZ and shrouds for an '03 WR are $10 different. I know that the '03 WR uses a larger radiator (1 core), but the WR rad shroud part number says they fit '03-'05 and '05 WR's use the smaller radiator for the YZ. What gives? Do I need to spend the extra $10 or not. Any info is greatly appreciated. Wrightco out.