Aluminum One Piece Knuckle Arm (2) Posted on 2017/06/272017/08/22 adminPosted in OP KO, OP R1, OP SB, OP SB 4, OP SB S, OPTION PARTS, PRODUTS GM51105S $42.00 Main Features: Light weight and CNC Machined from solid billet aircraft aluminum Silver finish One piece heavy duty design Fits Gmade R1 rock buggy and GS01 chassis What's included: One Piece Aluminum Knuckle Arm x 2 (Left & Right Side)