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@scherrit
Yup, you'll prolly be able to tell the bearing supplier what you want by looking very carefully at the old bearings when you've got them out- there is usually a code number on the bearing somewhere- for example we seem to see loads of 6001- there may be a letter code after the numbers (RS, c3, L8 on some random bearings I have here) but these relate to the service conditions or the type and number of seals - google the bearing mnfr sites -SKF for e.g. and you'll see what I mean.
Numbers may be on the steel of the outer race and/or or the steel or rubber seals on the side. Once you have the bearing code, all should be fairly straightforward- I tend to get a decent but not madly expensive branded bearing- so SKF for example.
Good luck,
Scherrit.