This is one of the best additions I have made to my 2006 YFZ450 and I have a lot invested in this quad! I am 6’ 2” and ride pretty aggressively so I ordered the + 1-3/16” steering stem with the quad racer low bend bars. This bend is similar to the CR-Hi bend that I was previously running with the Protapers I had installed. The quality from Houser and Fast Flexx is top notch and everything went together like it was supposed to. Motosport does not offer them, but I would highly recommend contacting Fast Flexx and ordering a rebound kit for the bars. It costs around $25. This kit reduces vibration even more and provides a firm feel when you hit the gas or pull up on the bars. I originally bought the stem with Protaper bars because I was trying to go cheap, but ended up buying the Flexx bars later. I could have saved money and bought these bars from the start. I am holding on to the Protapers just so I can swamp them out if I ever decide to sell the quad! Bottom line… buy them!