Today was the day to fit new output shaft bearings. Out with the old with little effort, retaining collars and old bearings came off as per the book and one shaft assembled with new non OEM alternative bearing.
After assembly l noticed a gap of about .5mm between the bearing inner race and the shaft shoulder. Inspection of the OEM bearing and the replacement shows a significant difference in the inner race chamfer. Looking at the shaft shows just why such a chamfer is required.
The bearings need to be modified by grinding an increased chamfer so they can seat correctly against the shoulder. Seating on the root radius of the shaft will result in a change to rear wheel camber but could very well result in inner race deformation or the total destruction of the bearing given the substantial force called for in the seating of the retaining collar.

 

And thats why they are so much cheaper. Thought they come with a shim as the replacements are narrower, placing it at the shoulder side will eliminate the problem?