The hubs come from Ford with the wrong size studs. I’m not sure why they couldn’t just use these, but the kit comes with smaller 1/2-20 studs. You can see the difference between the old (on the left) and the new on the right.
Installing this was much more of a pain than the instructions would have you believe. It’s pretty trivial to knock out the old studs with a hand sledge, but the instructions have you use a lug nut and washer to draw the new stud into the hub. The problem is that it takes substantially more force to turn the lug nut than I could apply (and I’m quite a bit stronger than the average person). With an unlubricated lug nut, I could easily reach the recommended torque (100 ft-lb) long before bottoming out the stud. I ended us lubricating the studs with ARP Assembly Lubricant and using an impact wrench to draw the stud into place before applying a final torque with a torque wrench. It was a little bit of a pain to clean all of the lubricant out of the threads, but it was worth it given how easily it set the studs. I probably should have taken these down to the TechShop and used their large arbor press to press them in, but it’s done now.