Well sods law, those wheels may require more effort to make them work.
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The internal diameter is just too tight to fit over the knuckles

and slightly more positive offset isn't helping either. You'll notice I couldn't even get the rear wheel nut on at all.
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I found this video of a Mojave Grom rally car conversion, at 3:15 he uses Tamiya m chassis wheels and also uses longer axles and knuckles from the granite grom. So I might try those granite parts before looking at M wheels