Lower control arms feature 4130 Chrome Moly 0.083 wall thickness seamless tubing CNC machined and tig welded in Billet Steel Fixtures for a perfect fit every time.* Silver Zinc and Silver Powder Coat Finish* 4130 Chrome Moly Seamless Tubing (Lower Control Arms)* Manufactured from Indestructible Heat Treated Steel* Upper and Lower Control Arms fully Tig Welded in Billet Steel FixturesIncludes:1. Chrome Moly Adjustable Race Lower control arms2. Chrome Moly Double Adjustable race upper control arms3. Anti-Roll Bar with roller bearings*4. 7075 Billet Spherical housing bushing kitQuality Construction:Lower control arms feature 4130 Chrome Moly .083 wall thickness seamless tubing CNC machined and tig welded in Billet Steel Fixtures for a perfect fit every time. 7075 billet aluminum bushings and high strength performance alloy rod ends.Upper control arms feature Chrome Moly Formed boxes that have been revised with a gusset to eliminate any flex or unwanted distortion from Ultra High Horsepower Mustangs. The 4130 Chrome-Moly threaded adjuster system allows these bars to be fully in car adjustable on the fly or between rounds in the lanes.Setting your pinion angle just got so much easier that it can be done in just minutes.All parts are Fully CNC machined and Tig welded in billet steel fixtures to ensure a perfect fit.The Silver Zinc Plating will withstand the Elements & Resistant Corrosion.Last but not least is the 7075 billet aluminum bushings and high strength performance alloy.*Anti-Roll bar will NOT work with stock tailpipes!Fits these vehicles:1999 2000 2001 2002 2003 2004 GT GTS Bullitt Mach 1 Mustang Roush Saleen & Steeda Vehicles.