lug nuts?

I just got a set of sbp cragars off a member here and I need to know what lugs to get. I still got the stock left hand threads. They are direct fit, not unilug cragars. I need to know what to tell the shop when I order the lugs. What size are the stock studs? 7/16 or 1/2?(69 dart) I've seen both. Any help would be appreciated.

Thanks,

Andy