Monkeywrench Racing shows that the same shifter cables work for all first generation Matrix/Vibe with the manual transmission.
Don't know if that's actually true, but I've ordered some small parts from MWR before and been satisfied with the products and service I received.
They have the shifter cable pair on their website but it doesn't say if it is in stock and it is $535 plus shipping.
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https://www.monkeywrenchracing.com/prod ... 03-08-all/]