Conversion set for T4'20 to change it towards T4'21 Aluminum Solid variation. Includes all necessary elements including aluminum solid framework, graphite top deck, body upstops & battery adj. width meals, composite 4° c-hubs for body upstops, composite bumper upper holder brace, composite adj. battery power holders & backstops, springs, ECS drive shafts 52mm, aluminum steering plate 8mm, aluminum gear tensioner, aluminum engine mount, aluminum framework brace, aluminum back suspension system, holders with centering pin, steel solid drive shafts along with other components,