One of the best things you can do for your 2017-2019 GM 6.6L Duramax 2500/3500's braking performance is replacing the weak factory calipers with set of aftermarket brake calipers. Give your truck the performance it needs by checking out our entire selection of calipers here at Alligator Performance! GM Duramax Fitments: 2017, 2018, 2019 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.