Product updated on 2021-03-04, BDS Suspension - BDS:121253, 2019+ GM 1500 BDS Upper control arm kit, Due to premature upper control arm ball joint wear being witnessed by our dealer network on stock, leveled, and lifted 2019-2021 GM 1500 trucks (including AT4 & Trail Boss), BDS Suspension highly recommends 121253 upper control arms, BDS Suspension designs the packaging for their lift kits in the most efficient way possible. This means splitting lift kits into various kit boxes to enable them to be shipped easily and also so that you can mix and match kit boxes and assemble them into a variety of different lift styles. This part is on box of a complete lift kit and generally is not ordered by itself as several other boxes are required in order to make a complete BDS lift kit.