While I can't speak about a VLX 600, on my ACE 1100, I was able to put on the Biltwell Keystone bars. I didn't need to extend any of the stock wiring or cables with those. If anything, I actually had more slack in the cables. I had thought about going with the Chumps, but wasn't sure if the stock cables and wiring would be long enough.
Either way, I've had two sets of Biltwell bars, and I've found them to be very well built. Compared to some other bars, they feel a lot more sturdy and well manufactured.