View attachment 520378
Those are the bolts I used for my headers.
You may want to have a low profile cut off wheel or equivalent. If you see my thread on my project you will see I had to mutilate my old headers to get it off the broken stud. Strangest experience of my life. haha My buddy came through with a Dewalt cordless cut off, we used a wheel that was wore down pretty far and were able to get to down to the stud without grinding unwanted surfaces.
Also, grab some moving blankets or weld blankets. It makes cleanup much quicker if you end up up grinding the old ones off