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Genuine IAME early-type (3-hole-sprocket) Leopard clutch drum part # A-60550, with included 16T #219 sprocket. Drum has internal countersunk sprocket mounting bolt holes and bolts mounting from the inside, as required for use with the 16T sprocket (see photo).
Both are used, drum shows virtually no wear. The sprocket has one moderately-damaged tooth (see photo); the remaining teeth show ~25% worn / ~75% life remaining.