Focus on spring pots.
The front threaded tubes had significant rust. The passenger side was bad enough that I had to cut the frame and bend the mounting tube up to get it out. At this point I had already decided to replace the frame.
The new threaded tubes had some damage on the threads that was easy to clean up with a file. Everything went back together with lots of copper grease.
The new rubber bumpers were too tight, so the spring pot assemblies would not fit in the frame. A hook blade for cutting tar paper was a perfect shape to trim the edge of the bumpers down. The specs call for a little play, but I ended up assembling these with less play than I’d like.