Pro y axis rail ball bearing size?

What size are the balls in the Y-Axis bearings. My Calipers say 2.77mm to 2.75mm. Also where can I buy 50 of them to rebuild my Y-axis linear bearings. Just the four Y-Axis need to be rebuilt. Moved and wasn’t thinking and took the gantry off so I have few missing. balls went everywhere. If I’m going to rebuild them I want to use the best available. I found these on Amazon They have 2.5mm as well. 3500 is a lot of balls. Thanks for the help.

I don’t know the answer, but I would advise to contact about this

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