These are the aluminum front direct cups which were first included in the TRF420 chassis kit. Lightweight aluminum components have a durable anodized finish.
Compatible Chassis TA07 MS*1, TA07 PRO*1, TRF419*1, TRF419X*1, TRF419XR*1 & TRF420 Chassis
*1Use with Item 51642 TRF420 Front Direct Pulley (37T). Two 3x10mm hex screws are separately required.
*The official Tamiya R/C Parts Matching List has plenty of information regarding chassis compatible with Tamiya Spare and Hop-Up Option parts.