Axle beam bushings are fine. I inspected them closely since I had just done them on my 00 Jetta last month. Billy, I made a tool to install bushings that makes it REALLY easy to press them into place. Cost under ten bucks, and easy to make. LMK if you need details.
Anyways, got it figured out. It was a missing left rear caliper bolt, allowing the caliper and pads to rattle around a bit. Replaced the bolt, all is well. I should note that I believe that bolt is noted "always replace", but it's not because it's TTY, it has locking compound on it when new. I always reinstall it with red Loctite. Perhaps I'll go with new stock next time...