No, they are not the same bars as a 300x. 300x bars are shorter and donot sweep forward like the duster mx bars. You can use bars from a duster mx, 400x, R4001, Eliminator, Dominator and the 400 two speed model. Bars from the bigger 10" wheel cats like the Endura, wildcat etc will not work either they look the same but there base is about an inch wider.