Lug Nut Size

[jjerrel@copper.net]

Hi.  I am in the process of buying new alloy wheels for my TR6.  When
placing the order, the salesman asked the lug nut size?  I did not
know.  He looked up his spec sheet and said it was 7/16 and we went
with that.  I am curious if they are 7/16?  I measured and it seems
they are either 7/16 or 3/8?  I would appreciate anyone confirming
the correct size in case I need to call and change my order which is
on backorder for about 3/4 weeks.  Thanks.