A-R83021-AI Gasket, Exhaust ManifoldTwo New Aftermarket Replacement Exhaust Manifold Gaskets Fits John Deere Tractors and Combines This aftermarket replacement exhaust manifold gasket seals the exhaust manifold to the cylinder head on Fits John Deere 6404 and 6466 series diesel engines. Sold in a pack of 2 gaskets. Compatible with a wide range of Fits John Deere tractors and combines spanning several decades of production. Compatible Models Fits John Deere Combines: 6600, 6602, 6620,