Find the Thermostats & Housings you need to repair or maintain the cooling system in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax Stock, higher, and lower temperature thermostats are available to match the needs of your cooling system. Whether you need a billet upgraded housing, or a stock replacement, you can find what you need to fit your budget and application. Find Mishimoto, Dorman, and many more high-quality brands available at XDP.