Product review (5 stars): Seemed to be exactly like the original one in all dimensions
Seemed to be exactly like the original one in all dimensions, including thickness.
The center hole is D shaped.  My old one had the center hole stripped out into a circle.
The issue on my dryer was there was just enough axial play between the snap rings to allow the back of the squirrel cage to hit the enclosure around it.  Then the little nubs that stick out at the top of the back side squirrel cage would jam up on some indented areas of the enclosure, and that would cause the center to strip out.  To prevent that from happening again, I added a 1/2 inch washer behind the cage, that removed all of the lash and force it forwards into a clearance condition.  Anyways I read reviews of similar, slightly less expensive items being thinner than the original, so I am glad that I found this one.  Highly recommend.