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Stockers on 13's are 12's already. And if they're not, they're like a fraction of an inch off. I feel like I lost height when I went with my 10 inch R6C's.
So, to answer your question, you don't have to change a thing.
I put 12" r6c's on mine and they are slightly taller, but not by much. The cables were a good fit, so no worries there. I agree with the above post that the stock ones are closer to 12 than they are 10.