Hey derb,
I would recommend sticking with OEM bolts for, at least, the manifold. You can even reuse some of the older ones that are intact. What I did not include in my update when I did my install was that I purchased bolts from a local hardware store with what I thought was the appropriate thread size and pitch.....to make a long story short, my mechanic had to
rethread my mistake.
If I had to do it over again, I wouldn't mess around with it. I would have just purchased OEM parts from the stealership. Definitely a cheaper way to go in the long run. Also, there's too much cheap hardware out there that people try to pass for the real thing and IMHO it's not worth screwing up your ride.