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hugo7-
C3 if I am correct is the clearance advised for press-fit assembly in a metal parts, that way the clearance is reduced once assembled to a more acceptable value (e.g. in idlers with metal pulley).
If you managed to extract them with simple tool ("light" press-fit with hammer for example), I reckon the standard ones should be alright but @mdcc_tester will probably be more useful than me
paulbiche
You might as well get a reputable brand if you're investing time in changing bearings. I like SKF, but FAG, NSK etc. are fine too.
With few exceptions which you will understand if you ever come across them, you want rubber seals, not metal shields