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Linear Bearing Ignorance

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Hi. I recently purchased a used Monoprice Maker Select and I am starting the standard upgrades. I purchased a new Y carriage plate and starting searching for some quality LM8LUU bearings. Misumi's are a bit more than I want spend and after that most bearings I have seen for sale seem to be generic chinese bearings. I found Vxb sells them for 9.99 a piece. I have had good luck Vxb bearing in the past, I use them in my wood working machines. The only thing that has me curious is that the Vxb LM8LUU bearings say that they have 4 ball circuits. I assume this means that there will be four points of contact with the smooth rod. Is this adequate for 3d printers or do I need to keep looking. Also if anybody has a recommendation for a quality bearing that would be a great help.