This front knuckle arm set is supplied as an RC-scale replacement for HPI Bullet vehicles where owners want an alloy option. The gunmetal alloy offers a stiffer mounting point versus plastic arms and is intended for model-scale nitro trucks that require durability while keeping the original suspension geometry intact.
Fitment concentrates on the Bullet family that uses the BULLET 3.0 MT and ST layouts; always cross-check your chassis service manual or parts diagram to verify knuckle pivot and ball stud spacing prior to purchase. The arms mount as a direct replacement to the stock steering knuckle pivots and suspension uprights.
Practical advice: move over your steering links and hardware during installation, tighten hex screws to recommended torque and recheck after initial use, and confirm steering geometry and toe. Because alloy knuckles alter front flex, expect some change in steering feedback and reduced deflection in demanding conditions.
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