How long have you had you PSP, mine is upward of 20 years old. I have a set of bars with notches ground in them for the 125. I worried that the notches might weaken the bars, but they didn't. I make certain that the upper end fits in that relief perfectly.

PS, I received a brand new Super Tigre Silent muffler and header yesterday, 29 bucks shipped. It came from a guy called the Arkansas Peddler.