This is an interesting item for me I don't know much about I have a few of these rotors be sure to check out my others this will be a good deal if someone can identify what it fits. This one is a 9 KW. it's about all I can find . Overall length is about 18" the rear shaft measures 6-3/4" long with a 1-1/8" diameter.  I will try and answer any questions but I don't know much about.  Item is NEW never used has a little bit of rust from being in stock for a few years. Bearing size is 6203RS