Here is the mounting bracket on the motor,
As far as the idler pulley,, I just picked one from a NAPA book that looked like it would work and started in on some "eyeball engineering". I used a pivot point that was beefy and existing on the Alternator bracket.
For the upper two mounting holes along the top edge of the bracket I had to tap and thread the block,,(If you are wondering,,only one of the two bolts, allen head, is in one of the two the holes for this pic).