Some updates, B14 bar will not mount on B15/P11 because B15/P11 don't have a removable break line holder.
B14:
B15 and P11:
Here is what Whiteline BNR28 for B15 looks like
I'm trying to get my hands on one soon, I will try to use it on the P11 soon, if it fails then it will go on the B15 (Which has a Nismo bar currently), Nismo bar then can go on the P11
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I've been thinking about this more, and something hit me, doesn't this technically eliminate the ability of the beam to move up and down, thus your putting stress on the bar and on the mounting points. Did your ride comfort decrease any after install?