Sbp Lugs

I have sbp Cragars on my car and last night taking a lug nut off it split in half. These were new lugs sealed in a Cragar bag I got when I bought the used rims, the guy gave them to me {no charge}. Anyway I went to two performance shops to get a few more and they do have the 7/16 nuts but the shank is larger than the hole and will not fit.
Anyone know who would sell these? Or is it a only Cragar type lug.
Thanks
AL