Conversion set for T4'20 to transform it towards T4'21 Aluminum Flex version. Includes all necessary elements such as for instance aluminum flex framework, graphite top deck, human body upstops & battery power adj. width dishes, composite 4° c-hubs for body upstops, composite bumper top owner brace, composite adj. battery pack holders & backstops, springs, ECS drive shafts 52mm, aluminum steering plate 8mm, aluminum gear tensioner, aluminum engine mount, aluminum framework brace, aluminum rear suspension system system, holders with centering pin, metal solid drive shafts and also other elements.