This remanufactured Duramax Fuel Injector will fit a 2001, 2002, 2003 or 2004 GMC Sierra 2500 or 3500. The Fuel Injector will also fit a Chevy Silvarado 2500 or 3500 and a Chevy C4500. 12 MONTH UNLIMITED MILEAGE WARRANTY. There is an additional core charge of $170. You purchase your fuel injectors from us and pay the core charge up front. We allow you 30 days to send your core injectors back to us. MUST ADD ACE PRODUCT CODE# LD9FILB7DCOR to the order.