Optional. Small Headed Key. All models. Tahoe. Terraza, Uplander. Pontiac. Incl.Housing. Montana SV6. This part requires programming and/or special setup procedures GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle Helps power on and start your vehicle This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Collision parts are designed to help promote proper and safe repair