Onan Distributor drive Gear part # 166-0303 fits the JC I USUALLY HAVE MORE STOCK OF ALL MY ITEMS AND CAN SAVE YOU MONEY IF YOU ARE INTERESTED IN LARGER QUANTITY PURCHASES. I AM ALSO GLAD TO SELL YOU A SPARE IF THAT IS ALL YOU NEED. If you have further information regarding this or another item I have for sale, please feel free to let me know so that I may post it here for buyers who may not have such information. Please look at my other items in my STORE and add me to your favorites list. NOS means new old stock. These are items that are still in new and unused condition that have been on the shelf or in storage for a number of years. Most of my items are in the original factory boxes or cases. Some of these boxes show a good bit of wear and tear from storage time and handling. I try to add to my store listings all the time. Please keep in touch. I am not an expert concerning much of what I sell . Please send part numbers when inquiring about certain parts. Sincerely, Mike Don't forget to click on SEE ALL CATEGORIES in the left hand navigation bar.