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.
Cronical through bolt lug----->
http://www.summitracing.com/parts/rnb-711-306/overview/
Direct bolt lug bolt---->
http://www.summitracing.com/parts/wld-601-1426/overview/
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.
Moroso bolt--->
http://www.summitracing.com/search/brand/moroso/product-line/moroso-wheel-studs?autoview=SKU
