Is there a trick to getting these M22 bolts to fit in this hole. Just by looking at them I can tell the M22 bolts are bigger than the hole in the manifold. I got M22x1.5 bolts, are those the right ones?

 

what kind of headers?

M22 fit my hooker shorties

 

Generally, the M22 plugs fit into the single-cat manifolds, and the M18 plugs fit into the dual-cat manifolds. Is it possible you have a "CA emissions" 95 with the dual cats? A buddy of mine had one of those, and gave me his M22 plugs because they wouldn't fit his dual-cat 95.