The aluminium rear upper arm listed as model DT3057 is an aftermarket replacement made to fit the Tamiya DT-03 chassis. Supplied as a single pair, it fits the rear upper arm location and is used mainly for setup work and suspension adjustments.
Replacing the stock plastic arm with aluminium gives a firmer mounting location for the upper link, which can help when dialing in rear roll and toe during handling tests. Always confirm clearance and fastener compatibility on your chassis.
Ideal for DT-03 builds that need a metal rear upper arm for tuning or maintenance; trial fit before final tightening to ensure correct geometry.
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