Yes thats what it will be, you also may need to know the width of the bearing to check it will fit in the housing.
There is a good discussion on bearings (allbeit in reference to IC motors) on the UK based RC Flyers web site, see > http://www.websherpa.co.uk/cgi-bin/yabb/YaBB.cgi#quest
You will find your bearings much cheaper from a bearing suppler rather than a hobby outlet.
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