Ok, best option so far I think. 9/16" ID x 1" OD thin and stainless steel (so it can be polished). I don't know why I'm obsessing on locating a washer for this but I hope it helps.
https://www.ebay.com/itm/9-16-THIN-A...S!-1:rk:6:pf:0
https://www.ebay.com/itm/9-16-THIN-A...S!-1:rk:6:pf:0
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