7/16" wheel studs

Well, the local speed shop came with some nice 7/16" chrome capped nuts for
the old mags on my Bugeye, but now I need to find the studs.  I'll check the
local Kragen, Pep Boys etc.

The burning question de jour is...  what is the correct size to redrill the
holes for the 7/16" studs?

Getting ready for the UBSCC all British show in Dixon on the 21st and it
wouldn't do to have rusty little nuts.

Regards,
Glen Byrns
'59 bugeye