These A-arms utilize tall ball joints, drastically improving the camber curve over OE arms/ball joints. This camber gain ensures maximum tire contact while cornering. The upper arms also have revised cross shaft geometry and shorter overall length, requiring less shim stack to achieve negative camber on lowered cars, or race and pro touring vehicles with aggressive alignments. The combination of cross shaft design and the shortened overall A-arm length gives you a improved camber curve through the front suspensions range of motion.BMR Suspension AA027 Non-Adjustable Upper A-arms are available in black hammertone and red powdercoat for long-lasting good looks. Installation time is 3-4 hours. Proudly made in the U.S.A.Control arm hardware kit RH006 (Includes upper and lower control arm hardware - Highly Recommended) also available.