The MAHLE HS54580B Head Set for your 2007.5-2010 GM 6.6L Duramax supplies you with the gaskets and seals needed for cylinder head removal, with the exception of the cylinder head gaskets (sold separately). MAHLE head sets give you original equipment form, fit, and function, so they fit just like the original. MAHLE head gasket sets are packaged in shrink wrapped tray, giving you the ability to view the contents prior to opening the package. MAHLE utilizes OE equivalent or better materials in all their head sets providing you with the Best Solution for your sealing needs