FYI, I couldn't find this on the site, but my parts guy found a replacement. I used Carquest:
SS525 (old number)
53-27300 (new number)
Either one should cross in their computers. It's not an exact replacement, but it's pretty darn close. The only significant difference is that the posts on the back don't come out at angles, like the original, so it can be a little tricky getting everything hooked up if you don't have any slack. I ended up bending the cable-ends a little to give me some clearance, too.
Hope this helps somebody.