Trüpower Motorsports Arctic Cat 2006-2008 400 DVX Premium Direct Replacement Upper End Knuckles are manufactured to meet or exceed OE specifications following rigorous quality control and product stress testing. Trüpower Upper End Knuckles stabilize the suspension/steering system so your ATV continues to perform the way it was meant to perform. Plain and simple, our Arctic Cat 2006-2008 400 DVX end knuckles are built to last so you can work hard and play even harder.