The factory third brake light on your 2007.5-2010 GM 6.6L is often overlooked, but upgrading to an aftermarket LED third brake light can make a significant difference for your GM 2500HD/3500HD. Whether you’re replacing a faulty stock light or seeking improved visibility and style, Alligator Performance offers a variety of LED third brake lights to meet your needs. With easy installation and increased light output, these lights provide a hassle-free upgrade in both lighting and style for your GM. Pair your new high powered 3rd brake lights with our selection ofTaillights!GM Duramax Fitments: 2007, 2009, 2010 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.