The OEM reservoir covers on Ducatis corrode. The result is peeled paint and pitted covers. The culprit is the material of the covers – inexpensive pot-metal. The solution is this billet anodized reservoir cover. There are 2 different-sized covers. The smaller cover measures 1-5/16″ (33.3mm) x 2-1/4″ (57mm), and is used on most pre-2005 Monsters, and early model SS and ST. The larger covers is slightly larger, and is used on late-model Monsters. Available in Black only. Some models have 2 small covers, some 1 small and 1 large.