The Napa Gold 7121 WIX 57121 Hydraulic Filter is designed to fit Caterpillar dump trucks from 2001 to 2010, specifically the AD45 model. This filter is a new old stock (NOS) item that ensures high quality and compatibility with the specified equipment. With the NAPA brand reputation for excellence, this hydraulic filter is a reliable choice for maintaining the performance and longevity of your heavy equipment.