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If you get it de-gummed and the bearings don't feel sloppy or notchy, you are fine.

If you don't have a set of calipers, you should look into getting some just for situations like this where you need to find a bearing size. Harbor freight has cheapo ones that are plenty close enough for this hobby. But if you want some good ones, SPI, Mitutoyo, or Starrett make really nice...

Bearings are bearings. If you need one without a seal on one side you can buy them that way as well. I guess what I mean is bearings are not specifically made for RC. Bearings with shields on one side, both sides, metal seals, rubber seals, flanged bearings , etc, etc, etc are common in various...

Bearings are a general size. You can find any size bearing on ebay or places like McMaster Carr. Just measure the ID, OD, and thickness.