We have bundled everything you need in a lift kit for your Sierra 1500 Denali 2WD/4WD with high quality Cognito components. There is no guesswork. Cognito components are engineered, manufactured, and assembled in the USA.The Cognito Front Lift kit is designed and engineered to offer superior ride quality, corrected CV joint angles, and steering geometry. The front struct spacers and standard white body rear shocks offer an efficient and cost-effective way to lift your truck while maintaining factory ride quality.The Cognito 2.5-inch Block and U-Bolt Kit includes 2.5-inch tall powder coated semi-gloss black cast steel blocks and heavy-duty zinc plated U-bolts.