Description It will add .5 Inch to the length of the front shocks for leveling applications where the OE upper control arm and shock is used.This extender kit is also used on Cognito lift kits that use the Fox shocks when the Cognito upper control arm is added to take advantage of increased droop travel. Mounting hardware is included. This Part Fits Year Make Model Submodel 2015-2019 Chevrolet Silverado 2500 HD High Country 2011-2019 Chevrolet Silverado 2500 HD LT 2011-2019 Chevrolet Silverado 2500 HD LTZ 2011-2019 Chevrolet Silverado 2500 HD WT 2015-2019 Chevrolet Silverado 3500 HD High Country 2011-2019 Chevrolet Silverado 3500 HD LT.

2011-2019 Chevrolet Silverado 3500 HD LTZ 2011-2019 Chevrolet Silverado 3500 HD WT 2011-2019 GMC Sierra 2500 HD Denali 2011-2019 GMC Sierra 2500 HD SLE 2011-2019 GMC Sierra 2500 HD SLT 2011-2014 GMC Sierra 2500 HD WT 2011-2019 GMC Sierra 3500 HD Denali 2011-2019 GMC Sierra 3500 HD SLE 2011-2019 GMC Sierra 3500 HD SLT 2011-2014 GMC Sierra 3500 HD WT.