i know 12's can keep the stock wires and cables. we installed a set on my friends 2012 EG might have to re-route some things as we did. when i installed my 14'' wild 1's i really think my wires would have reached without extending them. the brake and clutch wouldnt have.
12" are about all you can do. Some bars with different pullback you can get away with 14" but the cables will be tight and you will have to reroute the clutch in most cases.
Anything over 10 3/4" bars and your clutch nor your brake line will work. Even at 10" the wires have to be relocated under the radio to work without extending them. Just can't imagine how you could possibly get stock clutch and brake line to work on 12's.