Well, the replacement sway bar showed up today. I had ordered it online from the local Subaru dealer (cheapest place I found it, oddly), and the parts truck just drove up and dropped odd the new bar and matching bushings. Here is it in comparison to the bar I took off the donor car - the donor part is both wider and thicker, and has several mounting points on the ends, where the stock part only has single mounts. I have no idea what the donor part is, but it seems to be some kind of go-fast aftermarket part.
I believe that this is the last piece I need for the front suspension, so at the weekend, I'll be putting all of that back together.