QUOTE(Eric_Shea @ Nov 4 2010, 07:25 AM)
NST (no such thing) - 19mm bars are aftermarket and won't fit stock arms. 18mm turbo bars are one year only and go for around $400+. The stock arms are reinforced for those.
Best to look for a complete used 19mm set-up, either Weltmesiter (most common) or spring for the new GPR version... this way you get adjustable arms that will "really" help your ride quality on the street.
Hope that helps.
The GPRBar is 19mm (efective, because it is hollow) and fits the stock arms. I sell the bar kit, which includes the bearing blocks and hardware to mount the bar(no arms, drop links), for $225.00 to world members.