One of my tension/compression rod nuts fell off somewhere and I lost some parts on the road. While inspecting the other arm (the one that didn't fall apart by itself), I discovered that I only had one correct large washer (out of four), and the other smaller washers looked suspect as well. I also did a little searching here on the site and found that the recommended configuration is poly up front, but rubber in back to lower the stress on the rod. After a bunch of searching, I turned up P/N 45G