I HAVE A CUSTOMER NEEDING A PART TO MAKE THE 4WD WORK ON THIS FRONT MOUNT MOWER. JOHN DEERE NO LONGER HAS THIS PART SO I'M LOOKING FOR ANY PLACE THAT MIGHT HAVE ONE NEW OR GOOD USED ONE. THE JOHN DEERE PART NUMBER IS M805952 GEAR (18 TEETH), THE SUPPLIER THAT MADE THAT GEAR FOR DEERE NO LONGER...