The Auto Meter 17121 Triple Pillar Pod for your 2015 GM 6.6L Duramax LML is specially designed for a custom fit to your trucks interior. Designed to hold (3) 2-1/16" gauges this pillar pod gives you the ability to easily view and monitor your parameters with gauges of your choice. FEATURES: Triple Pillar Fits (3) 2-1/16" Gauges