4 0 ISX flywheel OEM P/N/casting 3680921R / 3680921 , believed to be compatible $175 USD ISX flywheel OEM P/N/casting 3680921R / 3680921, believed to be compatible across multiple 1999-2020 ISX, ISX15, X15 applications (verify fitment with dealer prior to purchase). Set up... ConditionUsedStock Number8144 MLS Number12535018CategoryFlywheels Last Updated10/23/2025 LocationSpokane Valley, WA, US Sold ByHigh Mountain Horsepower (833) 913-___ SHOWNUMBERCall Seller Email Seller Save More Info