Home / Engine Stuff / Flex Drive / Flex Drive Components / Drive Shaft Flex 447/503 w/Spider Drive Shaft Flex 447/503 w/Spider$295.00 Drive Shaft Flex 447/503 w/Spider quantity Add to cart SKU: FD60182-O Category: Flex Drive Components Description Description For the Rotax 447 and 503 5-Belt Pulley System, tapered & threaded. Drive shaft and spider assembly only. Replacement for OEM equipment on the Sprint and Sport. 22-1/4″ OAL Spider cannot be sold separately!