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With this narrow axle cases, you can reduce the width of your SCX car by 25mm. It is designed in a way, that the SCX parts, like C-hub, Knuckle, bearings, gears etc., will fit. Only the axles needs to be shortend by 12,5mm per side.
For a full axle you need the "Axial SCX10 narrow axle case (front part)" and the "Axial SCX10 4-link holder for narrow axle".