I ended up quickly ordering 3mm because I just want to get back into my NSX ASAP. Thanks for the 2mm recs though--will get later on if the extra MM seems too much.
I've never added spacers before. Is it simple plug and play? I know how the larger spacers with studs work but this is just like inserting a disc just deep to the wheel? Also, how do I know if my old lugs are long enough? I've heard that I should be able to do at least 5-6 rotations when tightening.