I just installed these while installing the 99 Blazer spindles, 11" rotors and dual piston calipers. Had I just been doing the control arms, it would have taken me just 30 minutes per side. Very easy to install for a reduction in unsprung weight and some great black powdercoated looks. The UCA bolted right to the Blazer spindle, since the Blazer spindle is geometrically identical to the stock one. Thanks for a great product!