Thanks Rex, that's what I was looking for - and thanks for including pics.
I haven't found any cracks yet, but have a lot more cleaning up to do. I removed the trailing arm bushings, it was a whole lot easier than I expected. Just drilled about 8 holes in the rubber (keeping the drill bit up against the inner metal sleeve), then tapped them out with a socket. Always wonder what went wrong when it goes that easy....
Maybe I could have gotten another 44 years out of these?
Only damage I've found is a bend on the underside of one of the arms, I'm assuming I don't have to worry about this (somebody please let me know if I should).