Sounds like you may be all set, but just wanted to let you know that I feel your pain. I went through this same search recently and was stunned at how long it took me to find a source (or even that the nut/washer combo I was trying to replace ever existed in the first place LOL). I eventually found them for sale on line in packs of 4 with the washers. If you still need the info, let me know.
