Buy Kuryakyn. My Softbrake +2 chrome is peeling off after 3 months. Sent pics to them and they'd "need to examine it" in order to determine if it is, in fact, peeling. Give me a break, it flaked off in my hand. The guy was a jerk.
I'm not sure of the difference(s) (if any) on the Ultra brake shaft and the Street Glide brake shaft, but I have a Kuryakyn extended brake pedal on a 2014 Street Glide Special. Best mod I've every made!