Thanks guys, I was able to find some hex socket black bolts with that size that fit perfectly. I also replaced all my coil pack bolts with a similar hex socket head. Now I just need to plan on removing the plenum to fix an oil leak from what I think is the valve cover gasket. Found oil on top of the spark plug on #5. Going to do some major polishing on everything that comes off to clean it up. Not sure on the age of the timing service, so add that to the list.