If you are trying to size bearings, there's an easier way. The ID and OD are encoded in the Kawasaki part description (buykawasaki.com). For example the H model KDX rear bearing part number is 92045-1239. So is the 01 KX125. So at least you know they are the same bearing. The description is “BEARING-BALL,6004X8JRLLX2/3A”
I don’t know what all the “X8JRLLX2/3A” is, but 6004 probably refers to the standard bearing size for the 6000 series of metric ball bearings. You can find a list of standard bearing sizes by looking around the net. A 6004 lists out as
ID = 20mm
OD = 42mm
W = 12mm