These are spare front direct cup parts for the TRF420 ¡°SPOOL¡±. Use them to replace worn parts in a timely manner, to maintain peak drive efficiency.• TRF420 Aluminum Front Direct Cups x2• Swing Shaft Cap Parts x1• Lightweight and with a hard coating, these direct cups offer superb durability.• Compatible with TRF420 chassis cars or those using Item 51642 TRF420 Front Direct Pulley (37T).