Mr. Gasket Thermostat Housings are high quality replacement parts built with extra thick bases to minimize warp. They are available in either steel, or aluminum and come in chrome, polished or anodized black for a quality finish that compliments your engine bay. Available for a variety of the most popular engines, some housings are available with a straight or swivel neck. Each housing comes complete with mounting hardware and an O-ring gasket (when applicable).