FITS RD350 (AIR COOLED) 1973-1975 R5 350 1970-1972 USA MODELS STANDARD STROKE OEM STYLE RODS WITH KEYED CENTER SHAFT TO PREVENT CRANK TWISTING OUT OF PHASE UNDER HEAVY USAGE AND RACING CONDITIONS-ALSO SPEEDS UP REBUILDING. INCLUDES H.D. ORINGED BEARINGS- WRIST PIN BEARINGS-LIGHTER ROTATING MASS FOR QUICKER ACCELERATION.