I just checked the acer site and got sizes for bearings :
5x13mm - 2 pc
10x15mm - 4 pc
5x8mm - 3 pc
5x10mm - 8 pc
5x11mm - 2 pc
Only problem is they don't list the 3rd size...are they all 3mm? Trying to get bearings before I get my kit which it seems will take an act of Congress only been on back order for a month and looks like it will be after Christmas before I get it. Sorry for the digression from the topic of bearings