I found some roller rockers that a buddy had that had never been used or even taken out of the box. They were supposed to go in a 95 5.0 Mustang, so if I'm correct the studs are 7/16. I was wondering if anyone knew if the '05 3.0 would have 7/16 or something else. Anyone know?

 

Where it bolts to the head? it's metric. not sure the size but it is similar to 5/16" in hole size.

 

8mm or 5/16"