WASHER THRUST WITH LIP FOR PLANET GEAR,A PLUS

The latest model Mini differential still use thrust washers on the spider gears but now have a tab on one end to prevent them from rotating on the cage side of the diff. The cage of course is cast while the gear itself is much harder and thus the whole assembly now lasts much longer.Check the casing seating where these sit for deep scratches where poor or old oil has helped deteriation