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