Broken locking lugnut for me too! Made my brake rotor install tonight a little more interesting.
Ordered a set of the McGard 21153's from Summit Racing (
McGard 21153 - McGard Wheel Locks - Overview - SummitRacing.com) before I realized Courtesy had the right part now from Nissan.
From what I read in the other thread about the locking lugnuts, the McGrad part should work just fine.