This is the correct suction and discharge compressor service valve set used on most 1969 Ford, Mercury & Lincoln products equipped with factory a/c using a York or Tecumseh compressor with Roto-Loc head that uses a square-cut Teflon seal. O-rings are also used at hose connections. IMPORTANT NOTE - This set comes with 1 valve that is for the #8 (Discharge) hose and 1 valve that is for the #10 (Suction) hose and 2 Roto-Loc Teflon Seals. Please double check your current valves and compressor for size (#8 and #10) and type (O-Ring and Roto-Loc).