6.404D Mid Esn Head Gasket Set Fits John Deere AR53630 RE524101 105 4000 4020 77One New Aftermarket Replacement Cylinder Head Gasket Set Fits John Deere 404 Diesel Tractors and Equipment This aftermarket replacement cylinder head gasket set is Fits John Deere (Fits JD) 404 Diesel engine and contains all gaskets necessary to replace the cylinder head (valve seals not included). It is engineered for use on Fits John Deere 4000 and 4020 tractors (engine serial number 215000 and later), as well as combines, and construction and