i have a 2010 model (pqx10sd) bps qualifier that is whining at middle to end of cast. i want to replace bearings, but can't find them at boca or vbx with out knowing size. anyone know size or do i need to go parts store to get measurements.

They probably just need oil, or it isn't even the bearings causing the whine.

Follow the recommendations on p. 1 of this help sheet.

Bearings that new shouldn't need more than lubing as JF said. If you feel up to it, remove and flush them prior to lubing for better results. A full service would be ideal.