Serpentine A/C compressors bolts

[hchad18]

I am mounting a serpentine system off a 90 Chevy blazer on my 71 chevy truck. The A/C side bracket has the holes wobbles out because the bolts were 3/8" bolts that ran all the way from one side of the bracket to the other side through the compressor. Checker auto shows plain 1.5" - 2" long bolts. The back side of the compressor has 12mm threads but it seams that the bolts should go all the way through to the front side. Can anyone help with a pic or tell me how this is supposed to mount. I have another bracket and don't want to destroy it.

Thanks