Wheel nut sizes

[Jay 535i]

Sorry for the bonehead question, but what size are my nuts? Wheel nuts, I mean.

[Kobe Diesel]

Your lug bolts should be M12x1.5 (according to realoem.com).
I believe the bolts for stock bottlecap wheels are 22mm long.
I had to get 33mm for when I installed 16" Style 5's with spacers in front.
Simply remove one of your bolts and measure the threaded portion.
otherwise the diameter and pitch remain the same.