Two washers make up for the trimmed front boss, the bushin in the rear of the lower mount will slide forward and compress them when the bolt it tightened, good lower alignment.
Almost there, upper bracket has a 1/4" rear bend for the original alternator....keeps things from linein up just right.
Heres the factory bend on the upper alternator bracket.
A medium smasherwacker removes the bend in the upper alternator bracket...1/4" forward movement acquired on the reinstall.
A split washer both sides of the upper alternator bracket makes the alignment perfect.
Hook up the original red wire from the positive terminal of the battery to the Batt terminal of the 12SI.