I have around two inch bar backs on my 05 Speedmaster. The stock clutch cable had to come out of the plastic retainer on the frame behind the front fender, and the cable is now wire tied to the oil cooler hose. Not the prettiest way to do it. If you're up at Toymakers, I'm five miles away if you want a peek.
I'd like to bring the bars back another two inches
Maybe over the Winter...