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They are not factory but Sylvestre sporting goods sells volquartsen 10/22 parts which are fairly reasonable and better than factory especially the extractor.
You may want to post an ad in the exchange. Gravel Agency now deals for Ruger in Canada. Also Dlask arms does 10/22 builds they may have lots of parts they did at one time.
Ask at the EE for someone who's recently bought a factory gun and replaced all the guts with (e.g., Vokquartsen) higher end parts? Or Western Gun Parts in Edmonton - but their shipping ain't cheep.
(Edit: maybe go into the exchange of parts for rimfire and put a WTB for what you're seeking)