my guess its not a 9.5 , those converters use a larger 7/16 bolt that needs the flywheel to be drilled out
stock was m10x 1.5 but the ptc 10" might not be metric , it may be 3/8-24 fine thread and unless you bought it used it should have come with the required bolts
At least you realized that your bolts came loose. I was in the process of tearing my engine down thinking that I had a horrible engine knock. One nut was gone , one was working it's way off and the last one was loose. That's when I got some locktite and info on proper converter spacing.
I was on my way to tear it down until I touch my converter bolt and seen how loose it was. Good thing for the board and everybody here for the input. Went out last nite and put up locktite. Now I can move on to my transmission pan little leak. Thanks for all the help