Industrial Injection GM Engine Cylinder Head Gasket Set For 01-04 6.6L LB7 Duramax - HS54580C2 Head Gasket not Included; Cylinder Head Bolts Not Included. MAHLE Original head gasket sets are packaged in shrink wrapped tray, giving you the ability to view the contents prior to opening the package. MAHLE Original head sets give you original equipment form, fit, and function, so the fit just like the original, MAHLE Original utilizes OE equivalent or better materials in all our head sets providing you with the Best Solution for your sealing