Putting stock h-pipe back on...

I have to put the stocker back on this weekend so I can go get my inspections/emissions done(just visual). When I took off the old pipe, I broke a few studs i believe, which didn't bother me much since I was installing full exhaust anyway. There seemed to be studs at all connections if I remember correctly, but I know there were up at the header connection.

I am just wondering why there are studs in the h-pipe though, considering the bbk headers had the stud get screwed into the header. So, can I just take out these studs and install it on my headers? Or are the holes through that connection threaded?

Thanks