83 xj750 exhaust manifold bolt/stud size

Hello everyone,

I bought my 83 xj750 with the exhaust manifold bolts/studs broken off inside. The previous owner tried to drill them out and destroyed the aluminum threads.
Does anyone know what size and thread Gage is in there? I'm going to need to find a tap or helicoil to fit, after I finish drilling out what the other guy failed to.

 

in this thread
https://www.xjbikes.com/forums/threads/exhaust-manifold-stud-measurements-80-650.119807/#post-601477

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My local yamaha dealer I ordered 2 studs and 2 nuts , think I paid 3.25$ I tried to find the metric studs at hardware store, Sears hardware...no luck on length all were to short . Autozone Carrie's metric helicoil kit that is the right diameter sorry cant recall the diameter.

 

M6x1

 

Thank you