6203C3 Koy Ball Bearing, 17 mm Bore Size, 40 mm Outer Diameter, 1.5748" Width

I bought a Stihl 039 chainsaw that had a scored piston. Once I tore it down, I noticed one of the bearings felt a little loose, so I figured I'd replace the bearings while I was at it. Had to apply a bit of MAPP gas heat to get the old ones off the crank (with some discoloring, but no warping of the crank). Tapped these new ones in with a socket/hammer. Put everything back together and all was well! Cheap solution, Japanese quality.