Airflow Aviation at Chandler Muni, AZ, (KCHD), bought the Airflow Systems air conditioning unit. Phone number, 480-331-4023. This is the part number for the flat belt. Suggest you replace the alternator belt and don’t forget a new O-ring for the prop. Ask me how I know!
Good luck.
btw I just installed the system on my 10. How old was your belt when it snapped?