This damper stay mount, identified as Tamiya 3451585 and linked to part code 42391 for the TRF421X, is an RC replacement/hop-up component that sets the shock mounting location on the chassis. It connects the shock towers to the damper assembly and is intended for use with TRF421X setups that follow the original mounting layout.
In use, the stay determines mounting geometry which alters shock angle, leverage and roll response. When installing this stay mount, keep the chassis' original mounting points and hardware to preserve alignment; the part is designed to match the TRF421X mounting architecture rather than change it.
Before fitting, confirm the part number (42391) against your chassis documentation and check mounting holes and fasteners for correct fit. Follow standard RC maintenance practice when inspecting thread condition and applying torque appropriate to your model's hardware.
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