This is a set of two Kyosho Pressure Plate Rings and are intended for use with the Kyosho ZX5 in the rear differential. Also called differential rings, these rings can be flipped over and used on both sides before they need replacement. These parts are labeled WBD04 in some manuals.
Royal mail at £3.50, or Express at £6.95.
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Some items cannot be sent via Royal Mail due to their restrictions.