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Have you determined what the new position of the grips will be? I read on here somewhere that the general rule of thumb is that you can usually go 2-3 inches from original position without a cable swap. Don't forget to check your front brake line too.
I have just fitted 8" Biltwell Chumps and all cables and wires were good, just bent the brake line to fit but am waiting on a 42" braided one to be made, to finish it off better.