Conversion set for T4'20 to transform it towards T4'21 Aluminum Flex variation. Includes all necessary elements such as for instance aluminum flex framework, graphite top deck, body upstops & battery pack adj. width meals, composite 4° c-hubs for human anatomy upstops, composite bumper top owner brace, composite adj. battery pack holders & backstops, springs, ECS drive shafts 52mm, aluminum steering dish 8mm, aluminum gear tensioner, aluminum motor mount, aluminum framework brace, aluminum back suspension system system system, holders with centering pin, steel solid drive shafts as well as other elements.