if you're racing in NHRA this is the ruling for open end lug nuts ... has to penetrate into the hex portion of the lug nut at least the diameter of the stud. so if you run shank bolts...needs to protrude past the lug washer at least its diameter
I bought some 1 1/2 long ones off ebay...think the seller was lug nut king...nicely made, threaded all the way....I say this because I just bought some ET style ones from ebay (different vendor) that were not threaded all the way and were actually oversized on the ends and couldn't be threaded.