I just picked up a set of R bars for my 2007 VTX 1300c. I also have ordered a set of Scootworks PhatRisers. The risers will give me about 1 1/2" in height and 2" more pull back (based on R Model spec's). I believe that between the R bars and risers I will gain close to 4" in additional pull back from my stock bars. My questions is, without re-routing the cables behind the triple tree, how much longer of a cable/s do I need to purchase?