yes they are the standard 7/8" bars on all MP3's, also the throttlemeister will work with a bunch of other m/c's too. put them up on ebay or in the for sale section here.
Since we're talking differences between the 250, 400, and 500...does anyone know if the inside diameter of our handle grips are the same size or not?? I have a set of Throttlemeister throttle locks and also HVMP brand extra heavy weight vibration dampening barends for sale that were used on my 250. Info would be appreciated.