This Kit includes all the parts when removing and replacing injectors. No need to reuse old intake plenum gasket and check valve bonded washers. Master Injector install kit for Cummins 12v 6bt, 4bt and 6ct engines. Kit includes 1989 year 9mm injector copper washers Qty 6 1991-1998.5 7mm Thick copper washers Qty 6 1991-1998.5 7mm Medium copper washers Qty 6 1991-1998.5 7mm Thin copper washers Qty 6 1989-1998.5 Banjo bolt copper washers Qty 6 1989-1998.5 injector square O ring Qty 6 Black injector dust seals Qty 6 1989-1998.5 Intake grid gasket Qty 1 1989-1998.5 Fuel return line check valve seals Qty 2