Good supplier, came when they said it would, good strong packaging, clean product, (remember it was from a breakers), and part number was clearly visible. Recommend this supplier to all who require replacement parts.
Original Mercedes spare at a very good price. My E55 had started producing some very odd symptoms related to the alarm system. Mechanic determined that the alarm siren was the culprit, spot on. Siren replaced and the problems have disappeared. For UK owners of w211 models, siren is behind inner wheel arch, drivers side towards the bulkhead. Simple steel shroud holding it in place.