Research and more research
I had a similar dilemma and I did two main things.
Get the manufacturer number info off the bearing you are replacing like "KOYO BHKM1730JU" it should be stamped on the bearing. If you can't get the bearing info from the bearing you can try measuring the bearing, internal, external diameter, width and do a google search. It is rare for a bike manufacturer to use a non off the shelf bearing, that is not made by about three different bearing manufactures
Do trawl of the internet for motorbike bearing suppliers. Quite a lot have bearings and models matched up.
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