They're the extra steering uprights the TRF420 battle car framework. They function the brand new 2-part front upright designs which utilize separate supply and bearing housing elements. You may also use these brand new uprights on current Tamiya touring vehicle racing platforms.
• TRF420 C Parts x1
• Components are molded in carbon fiber-reinforced plastic for superior rigidity.
• Compatible with TRF420, TRF419, TA07 and TB-05 PRO framework vehicles.