A while back there was discussion on stripped bolts on an engine. I think this guide can help determine which bolt and thread pattern to use. Hopefully the picture comes thru.
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yup… great.
Heh heh. I’ve found a welder can take the place of a lot of those various bolts.
I think I’ve used most of them! 
I could have used all of them at one time or another. But I had to make do with what I could find.
I think I’ve tried… 