Modified C-hubs with holes for mounting graphite human body upstop with height adjustable position to control once the human body details the graphite prevents. The C-hubs function big openings for faster & easier assembly/disassembly for the ECS. The entire ECS set up can be simply inserted/removed through the C-hub with no need for disassembly. The big openings prevent collision of ECS with C-hub in serious crashes. Caster pre-set at 4. Medium rigidity for carpeting race. Use with matching left-side C-hub #302364-M.