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I know the lugs went from 12 too 14, but should still fit with new lugs. The hub and bolt circle are unchanged from C7.
Why would you try to force GM OEM C8 wheels on to a C7? I don't care if they fit or not, it's a weird thing to do. And change the lugs? Might as well pop for some nice wheels that do fit your C7. Too many idle minds in the C8 Forum and that shoe fits.