asked many times before but search does not help. reply if i am wrong. '98-'02 yz400/yz426 seat and tank will fit on my '00 WR400? i am assuming this means the rear fender will bolt up also? what about radiator shrouds? will my stockers bolt to the yz tank? and finally, how about subframes? i see ac racing has an aluminum subframe for the yz 400/426. will it fit? how much lighter than stocker? need to lose weight (the bike, not me). other suggestions/comments about this subject would be great. thanks!