The 80 Amp alternator, which is the one that is mounted in a non-adjustable position (the idler pulley sets the adjustment) has a large bracket in the rear with a spacer. If you ordered A/C and the rear defogger - the glass with the electric grid, you got the 80 Amp alternator. Here is a shot of the bracket and spacer and bolt from my 73 SD. Both of my 72's had the same set up as well.
BTW, the bracket is actually grey phosphate and not painted.
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