Bearings are pretty much standard . The bearings in our engines will also fit many other things. When I purchace bearings I go to a bearing store like BC Bearings and usually they will have them in stock . I imagine there are many bearing stores you could find in the phone book .There are tiny numbers along the edge of the bearing race that will tell you what size it is . Other than that take it in and they will mike it . I am not sure about ceramic bearings though . You may need to special order them . I found out about the big industural bearing supply stores when I was working in the saw mill purchaceing dept . After that I bought all my bearings there. The ones for my wheels in my dirt bike were way cheaper than getting them from the bike shop . I would bet it is the same with our engines . If we order the bearing as a part special for the engine it will be expensive but if we get the number from the bearing and go to a bearing supply store it will be quite a bit cheaper .