Those are direct bolt lugs meaning the mounting surface to the nut is machined flat. They are required for a direct bolt rims. I'm not aware if all welds are a direct bolt wheel. You need to have the correct type.
Me personally would set it up to a 3" bolt. Moroso makes a good priced stud, stronger than the Domain but not the price of ARP's. You just need to know what Knurl size you need and what thread you want.
Here is a picture of my actual rims on my dart. I have the Moroso 3" studs on a direct bolt style rim. This picture was before I installed the 3" studs but if I had a current photo you would see them stick out about 1/4" or so.
