A little help ... G50/52 Mount bolt thread??

Guys,

I apologize for the trivial question, but I live in Charleston, WV, and materials resources are pretty slim. We have a local old fashioned hardware store that has some unusual things but most often I have to order high quality nuts, bolts and washers from McMaster-Carr if I can identify the size and thread.

I need that information for the large mounting bolt hole on the top of the inverted tail housing for a G50/52. I expect it is the same as the G50/50. The local supplier had nothing that will fit ... too small or too large in diameter. 12mm is too big, 10mm is too small.

I REALLY appreciate the help!
 
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