All - I got my brother to come over and help me with this. A new part plus shipping I negotiated for $130 even.

The belt squeal is gone!!!
My brother used a piece of pipe as a breaker bar on the big bolt. Then it backed out into the frame inside. It wouldn't back all the way out. He had to jack the engine up about an inch and a half and work the big bolt out. The new one went in easy once the engine was jacked up.
But, the problem is fixed. It cost more than I wanted to pay, but a whole lot less than the dealer wanted to charge. They wanted ~$40 to find the cause of the squeal, $166 for the part, and probably 2 hours or so of labor. That's probably another $100 or so. So, I'd say I would've paid $330 (including tax) or more to have the dealer do the work.
- Amber