You may also need longer brake lines. I don't know but maybe.
i have no problem sending you my pro taper contours when i get my Flex bars. I also have some risers I will send you. They setup your bars as if you have a +1 stem. You pay shipping.
Agree wuth Moose!!!!!!!!!!!!!!!The arms will make your quad wider a little in the front if you use the stock 300 shocks the geometric angle of them will be different I'm sure and you will me sitting lower. i'm putting 400ex arms on my 250X later on but I am buying the shock conversion kit from Diamond J Customs so I can add the 450R shocks for a better ride. you may also have to remove the bracket that holds the brake line in place to account for the width.