This Item can have a cast number.Cast number and Part number is not the same. Cast number is not a spare part number. M3BP200 Gen A & G,M2AA200 Gen A M3AA200 Gen A, C & G ID = 49 mm, OD = 250 mm, Height = 88 mm, Key 16*5 mm Key is integrated in the fan hub Code 068 metal fan kit : 5FSE704229-6