replacement bearings

[EddyCurrent]

Any bearing chosen must be capable of sustaining the required RPM of a spindle, also the grease you use is crucial at those speeds.
I replaced a bearing on a 20K RPM spindle for a pin router, the replacement was a FAG B7206-C-T-P4S-UL
it replaced a Japan NSK 7206C and the grease I used was SKF LGLT 2/0.2
Of course that bearing is most likely not suitable for your spindle but it gives an idea of what I used, and it's still going strong.

FAG bearings were the best price/performace offering I could find at the time but I can't remember which supplier I used.(it would be the cheapest though)