The box contains one large valve cover gasket, 6 smaller spark plug spacers and all valve cover bushing screws. Custom fit for 2005 Trailblazer with 4.2 L6. Oil will no longer seep into the spark plug wells or blow out the back of the valve cover. Exactly what I needed. Much cheaper than buying from the local auto parts store. DO NOT attempt this repair yourself if you are unfamiliar with this engine - disassembly/assembly to install this gasket is not for the faint of heart. Don't wait for instructions in the box, this is for mechanics. Shop Haynes, Chilton's, or YouTube for DIY instructions if you haven't already done the job.
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