The GM 6.6L Duramax valve cover gasket kit for LB7 applications includes one RTF26403 kit (containing injector installation seals / gaskets, return line banjo washers and lower rocker cover gasket) plus twelve (12) valve cover bolt noise isolator grommets (DT97213862) and four (4) valve cover injection line oil seals (DT97225457). The complete set is for use in GM 6.6L LB7 Duramax diesel engines.