The Nissan wheel locks for the Z have a slightly longer shaft is my understanding. The distance from the washer to the start of the taper is longer on the Nissan locks than the normal aftermarket locks available in the standard acorn style. Because of this the standard acorn style locks did not seat properly on the Z wheels when they first came out, so McGard provided special locks directly to Nissan dealers for our cars.
Read Post #25-35 in this thread:
Literal epidemic of rims being stolen. There is another thread linked in there that has info as well. PM DEpointfive0 with additional questions as he has probably test fit more locks than anyone here
