I got these studs off eBay and I’m not convinced there real. There for a GM 12 bolt rear end. (Cairrer bearing studs). They came in an opened bag with TA1815 written on it. The ARP stamping on the head of the stud is hardly visible and stamped twice. The nuts have the stamping on them too along the base of them. I have a set of head studs here I compared them too and the stamping don’t look the same. The old head studs have nice crisp stamping to them. I have sent pictures.