Conversion set for T4'20 to improve it toward T4'21 Graphite variation. Includes all necessary elements such as graphite framework, graphite top deck, human body upstops & battery power adj. width dishes, composite 4 c-hubs for human body upstops, composite bumper top owner brace, composite adj. battery power holders & backstops, springs, ECS drive shafts 52mm, aluminum steering dinner 8mm, aluminum gear tensioner, aluminum engine mount, aluminum framework brace, aluminum rear suspension system, holders with centering pin, steel solid drive shafts alongside elements.