YES they do....however...
YES they exist!..however, for my ATR headers, on the driver side header theres two larger sleeves in the flange that you need to just figure out how much longer you need for JUST THOSE TWO (1/2 inch longer i think). I ended up using socket head Stainless bolts instead of the ugly stock ones. ARP makes the header studs part#(070)120-1402 I use them for my ATR headers on my GN-1 Alum heads. So far so good. ARP phone #s are (805) 339-2200 800-826-3045 HTH