Well you'll be happy to know I got one of the 2 remaining bolts out cleanly. It had to be twisted about a million times without moving, used 1/3 a can of PB blaster, but it eventually worked it's way out through all the grime.

The other bolt, holding the bracket for the alternator, wasn't so fortunate. I thought I had it working back and forth, just a hair each way, spray, go back to the other bolt, wash, rinse, repeat (literally...I have a puddle of PB blaster under the car). Then it turned a little, and POP it snapped off the head.

So I have a handful of bolt heads, and an assortment of bolts. Guess I'll be investing in a set of extractors.