We've bundled everything you need in a leveling kit for your Silverado/Sierra 1500 2WD/4WD with high quality Cognito components.There's no guesswork. Cognito components are engineered manufactured and assembled in the USA. The Cognito 2 Inch Economy Leveling Kit includes the .75 Inch Strut Spacer Kit and the .5 Inch Preload Spacer Kit- all with hardware included.This leveling kit utilizes your truck's factory upper control arms but we recommend upgrading to Cognito upper control arms for increased durability and part longevity.The .75 Inch Strut Spacers and .5 Inch Steel Preload Spacers are constructed out of heavy duty steel and finished with a durable semi-gloss black power coating. Made in the USA.