here is how I installed dp sliders in my bv 350. stock rollers are 8-25 x 16 - 15.9 grams. sliders don't come in this size yet. I got my sliders from buggy parts NW, in size of 25 x 17 - 15 grams. I then trimed the sliders, using the side of a grinding wheel too 16 width. this lowered the weight to 14.6 grams. my bv had 4500 miles on it and the stock rollers were flat in spots. scot runs great with better take-off and I think lower rpms at speed.