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You know what, after that whole write up above, IGNORE it....
I just found out that the 1/2-20 bolt doesn't fit through the new Drive Belt Auto-tensioner!!!

So I think I will have to "use a Heli coil kit to re-thread it to OEM spec and use the OEM bolt" @ 12 x 1.25 mm

The question now is that it appears that for the Heli Coil kit I need a 31/64" drill bit... I'm just not sure if the existing hole for the 1/2-20 bolt is already larger than that?
I agree with what was just suggested. It would be easier and better to enlarge the hole in your new tensioner so that your new bolt fits. Since you know the new bolt threads properly and can be torqued properly.
 

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You can save on the bracket by going to a pick-a-part place(junk yard) if you decide to go that route. Should only cost around 10 bucks. Make sure the threaded hole is good before removal. But first try the longer bolt and see if you can fit a wrench to hold the nut when tightening. If you have the room. It will be a permanent fix.
Plus it’s good practice for how to remove and install the parts.
 
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