The 3 best shocks for your Silverado are Bilstein 1) Bilstein (24-186742) 5100 Series Front Shock Absorbe 2) 5100 Monotube Gas Shocks Set, 3) Bilstein 5100 Front 2-2.5", Rear 0-1" Lift Shocks Kit
According to Kenneth Taylor, the 3 best cold air intakes for your chevy Silverado are the K&N Cold Air Intake Kit 77-3082KP, the K&N Cold Air Intake Kit 63-3082 and the K&N Cold Air Intake Kit 57-3058.
These devices are usually designed to work correctly with all models. The only things that you should care for are the angles and the distances from which you spray the soap.