Thanks everyone - actually discovered a bearing shop about 20km from home. I'm amazed that enough people on the NSW central coast buy enough bearings to warrant a dedicated business big enough to carry the exact bearings I needed!
I gave the crud-covered mirror a much-needed very gentle wash and reassembled / collimated the old girl; she's once again a perfectly functional 8" f/5 reflector - at least as far as I can tell whilst it's bucketing down rain outside...
Thanks all for your suggestions, didn't realise they'd be so easy to source.
~C
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