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They will fit a worlds car but you need 1/4 inch axles as 1/4 inch is already bigger then 3/16 so drilling wont work.

if you've already ordered them, you'll need 1/4" axles of some type. whether dogbone, u-joint or cvd/a. That would be the easiest way to use them. You will also need the right yokomo wheels, the ones that are for 870c/yz10, and not the later wheels with the deeper offset, such as the JCracing s...

If there was enough demand I would have some made for 3/16 axles.