Kryptonite Upper Control arms are laser cut and welded into an extremely strong boxed design. Made with pride here in small town USA and backed with a lifetime warranty. Kryptonite UCA kits will improve the ride of any Stock, leveled, or lifted GM 2500-3500 HD truck but are also a great upgrade for your stock height truck. Kryptonite UCA's are compatible with any stock or leveled 2500-3500 HD and most suspension lift kits.