Your GM 2500HD/3500HD is a powerful off-road machine, but the factory lighting may not be enough for low visibility or dark conditions. Our selection of Off-Road Light Mounts for your 2004.5-2005 6.6L Duramax makes it easy to add powerful LED lights and light bars. These mounts accommodate everything from compact 3" cube lights to high-output LED light bars, ensuring you have all the illumination needed to navigate the trail with ease. Add additional illumination to your truck’s lighting setup with our efficient and brightHeadlights!GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax.Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali.Some exceptions apply, please see individual product pages for specific fitments.