This belt tensioner is designed to fit Cummins engines with models ISX CM570, ISX CM870, and ISX CM871. It has the part numbers 4059201 and 3680194. Made in China, this tensioner is a reliable replacement part for your heavy equipment. With its sturdy construction and quality materials, this belt tensioner is built to last. It has been tested to ensure it meets or exceeds OEM standards. Trust this product to keep your engine running smoothly and efficiently.