SPC's upper control arms are a patented design that will give you the most adjustability and best clearance of any arm on the market. Sold as a pair, upper arms come with ball studs that are 1/2” taller than stock to improve camber curve. Throw in some caster and the ability to tune camber and you will have a ‘modern’ feeling suspension. The ball joints are greaseable and rebuildable. Additionally, OE length and 1/4” extended studs are available to tune your ride or maximize your specific suspension geometry. Front upper Adjustment range: Camber ±3.0° Caster ±3.0°. DIY Installation time: .7 hr/side SPC's lower control arms will lower your front end by 1" and add 1° positive caster for an aggressive, ready-to-run stance. If you have coilovers use SPC's Coilover Mount and Spacer Plate 2 pack - part number SP95338, 4 pack - part number SP95332. Optional bump stop available (part no SP95339). DIY Installation time: 1.2 hr/side. Combine upper and lower control arms with SPC’s 1” lowering springs to complete the transformation of your Pro Touring, Track Ready, or daily driving street use American Muscle.