Detroit 60 AC compressor mount bolts keep shearing off

We have an issue with a 2011 Detroit 60 ac compressor mount. Over the past few months the top bolt on the mount keep breaking and then backing out and rubbing on the ac/alternator/water pump belt. We have tried using grade 8 bolts as a replacement and they keep breaking. Any suggestions or after market parts that we can change this out with?

Pictures

 

Pictures

 

Ac compressor mount bolts keep shearing off.

 

the original size hole was 7/16 so we coverted it to 1/2 inch. This bolt has snapped off probably 6 times in the past few months. We have tried hand tight, lock tite, impact tight, longer bolts. Literally everything. Yesterday the mechanic cleaned all the surfaces around each of the holes with a light grind just to flatten out any imperfections. We were able to then slide 2 washers inside each mount hole and sort of “shim” it so there was no more freeplay. Hoping this solves it cause some of the other suggestions to “change the compressor to a rotary one” seem wrong in that. This compressor is acting as a pully only atm. (Compressor is unplugged)

 

Thanks for the suggestions. What about the idea we had of just getting a belt from the alternator to the waterpump and cutting out the AC compressor all together? Have you heard of that or know of what type of belt that could do that?

 

So in your experience going to the rotary fixed the issue? Do you know the part number for it?