Lonestar Racing DC-4 A-Arm Rebuild Kit. Fits: Yamaha YFZ450 (2004 - 2013). Rebuild kits include all hardware that comes with a new A-Arm set EXCEPT ball joints for each specific model. DC-4 style - Any long travel DC-4 arms that do NOT have quick caster adjustment and use heim joints where upper arms attach to frame. ATV Galaxy is an authorized Lonestar Racing dealer located in Irvine California. Listing and template services provided by inkFrog.