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SKF 7206BEP, and SKF 7207BEP. A little hard to tell from SKF website data, but more or less equivalent to ABEC 5 ( P5, P6) with limit speed of 13,000 and 11,000.
There are few versions, I just went...

On my spindle, the so called dust cover is threaded, and the three "holes" are just dimples made with a drill. I loosened it with a few gentle
taps with a punch.
Got mid priced SKF AC bearings on...

Really enjoying your write up. Great photo's and you make it seem easy!

I'm in the process of converting mine too, although I will be using servos.
Overbuilt stand is done, and ridiculously...