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For later (49 up) The bolts are 7/16 coarse if I remember correctly.. As far as length goes, it depends on how thick the attaching arms of the stand are. Measure them and add one inch. You can shim them with washers.
For the earlier engines. there were two different sizes Coarse thread. Do what we usually do - take some bolts and fit them to the holes. Length wise, do what I mentioned above.
Grade 5 or better
This is not rocket science. With 2,200 or more posts,you must have some experience??