H&R 20mm Lug Size?
 

The previous owner had the 15mm H & R Spacers up front and 20mm in the rear which I assume has the stud replacement. Well dumb me took the spacers off to track down a odd noise when at speeds above 50, and had the rear studs go completely through the lugs, and now am in search of new ones. What size do I need for the rear 20mm spacers?

The hex size is usually 21 mm for most Nissan vehicles.
Thread is 12x1.25 mm.
The stock OEM 370Z wheels requires lug nuts with straight shank. Aftermarket wheels usually need lug nuts with a conical seat.
Length varies with application, but an open-ended lug nut would suffice.

What "size" were you asking?

I was wondering how long the lug has to be. Just so I don't bottom out the lug again