I use ARP #100-7702, which is a 7/16-20 stud. It presses right into my B13 hubs in place of the original 12mm studs, no drilling required.
I use these because 1) they're easily available at any speed shop versus the metric ones, 2) the nuts are available at any parts store as opposed to metric ones, 3) they're longer than most available metric ones, and 4) they have a tapered nose to minimize cross-threading, especially in high-stress conditions (e.g., quick wheel changes).
Good product.