This Tamiya replacement lower bulkhead is an RC-scale spare intended to fit the TRF421X homologation series using original reference 42391. It provides the structural mounting for lower suspension points and helps retain drivetrain pieces within the chassis envelope. The wording emphasises compatibility and service use rather than promotional claims.
When servicing a TRF421X-based touring car, this lower bulkhead is a typical replaceable item after impacts or wear. Confirm the 42391 identifier and check alignment at suspension pick-up points before applying final torque to fasteners. Accurate fit aids repeatable chassis geometry and predictable handling.
Lower Bulkhead: 42391 TRF421X
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