This is a NOS - new old stock genuine OEM Ducati part# 44710271A chain slider in original package, only opened at one end. Fits the Ducati superbike models 916R ‘97-‘98, 996R ‘99, 996RS ‘00-‘01 & 998RS ‘02-‘03. This only fits the extended or long swing arms. Does NOT fit the standard swing arm. See all pictures!