Description: Large. 2nd Design. Optional. Standard. Helps prevent leaks in various components of your vehicle This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type

Description: O-Ring.

Description: Provides a tight seal to help keep foreign material from entering the timing components