GEAR 1ST MOTION SHAFT pre A+ teeth but 18mm mainshaft 79-81

USED ONLY 17 tooth 1st motion shaft. It has Pre A+ teeth but uses the A+ mainshaft(18mm nose). we only have "USED" secondhand gear sample available--no warranty It is the early "A+" type and was only fitted for a short while(1979-1981) before being replaced with A plus gear pattern which should have a one groove marking all round the teeth. The A plus gear is DAM4930 which also had 17 teeth but with groove marking on teeth