TRF 501X thrust bearing #9949300?

[Howard1650]

After a fantastically enjoyable day at Worksop, (thanks to the organisers and everyone that help to make the event run smoothly.) I stripped down my ball diffs because they were unscrewing and losing all drive. After a quick inspection it was clear that the small thrust bearings had failed on both the front and rear. Although the thrust bearings were still in one piece, the outer cage had cracked. The rest of the parts were clean and looked ok. I rain the diffs tight (may be too tight) and, combined with very little grease on the thrust bearing, believe this extra load cause the failure.
For the re-build I will used the standard Tamiya parts, but is there a better alternative to the thrust bearing #9949300? This part is used on a lot of Tamiya cars.
I will also loosen the slipper to relieve the stress on the drive train, and remove the small pips in the diff pulley which could be touching the diff plate.