I figured that, I'll note a mod to move it, so check there later...
in the meantime, these are what work, and cheaper...
Exhaust Header Nuts (Replacements) -
McMaster-Carr 93795A230 M8.0 Oval Lock nut. Use with stainless steel washers.
(Note: The 2010 Service Manual shows the required torque @ 13ft/lbs.)
My personal opinion tho, working and specifying fasteners and torques and such, is that trying to achieve a 'torque' rating on a 'deformed' style lock nut, is nullified by the force it takes to simply tighten it on the threads, so I suggest just prudent 'good-n-tite' without bending the flanges.
best of luck,
