Roller Rocker geometry questions

When I ordered my stud kit I got the correct part number (on the box) but got the stud for the regular heads. Call arp talked with them and they sent me the correct ones.
I'm not saying a mistake was in your kit but it did happen to me.
Now that I think about it, I think the nut and stud are different but I'm not 100% on that anymore cause that was a few years ago and in the middle of me find a roller cam with an intergrated cast iron gear (oh, how much fun that was).