This Item can have a cast number.Cast number and Part number
is usually not the same. Cast number is not a Part number.
M2AA160 Gen A for shaft with key
FOR KNURLED SHAFT SEE KIT
5FSE704229-17M2AA160-180 4 POLE Gen C
M3AA160 6-8 POLE Gen C
M3BP160 6-8 POLE Gen A