The item listed as Tamiya 3451585 and tied to part code 42391 for the TRF421X is an RC replacement/hop-up component that locates the shock assembly on the chassis. It is the interface connecting shock towers to the damper and is intended for use on TRF421X-style mounting arrangements.
Operationally, the stay defines mounting geometry which affects shock angle, leverage and roll characteristics. When fitting the stay mount, preserve the original chassis mounting points and hardware to maintain intended alignment; this part is meant to conform to TRF421X mounting rather than alter it.
Check the 42391 part number against your vehicle paperwork before swapping, and inspect mounting holes and fasteners for correct fit. Use standard RC maintenance to verify thread condition and recommended torque values for your hardware.
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