This kit contains the following: upper & lower timing chains, 2 cam sprockets, crank sprocket, left and right guides for lower chain, upper and lower chain tensioners, front crank seal, and timing cover seals (1 for Altima and 2 for Frontier/Xterra). Timing cover gaskets are not used on this appplication; use the appropriate liquid gasket sealant instead. Also available (but not included in the kit) are the idler sprocket and special chain guide bolt (order separately if needed for your engine)OSK is a Japanese manufacturer of automotive engine timing components

This kit contains the following: upper & lower timing chains, 2 cam sprockets, crank sprocket, left and right guides for lower chain, upper and lower chain tensioners, front crank seal, and timing cover seals (1 for Altima and 2 for Frontier/Xterra). Timing cover gaskets are not used on this appplication; use the appropriate liquid gasket sealant instead. Also available (but not included in the kit) are the idler sprocket and special chain guide bolt (order separately if needed for your engine)OSK is a Japanese manufacturer of automotive engine timing components