I’m leaning towards the 38mm diameter washers. I looked on Ali Express and they have crazy good pricing but only let you buy 3 pcs as a “Welcome” deal. I became frustrated trying to find out how to buy additional quantities. Maybe I’ll just get 3 friends to place individual “Welcome” orders - darned Chinese.
In the ad, the price for 3 pcs is $.68 - deal! Says shipping is $.89. Still a deal! Hit Buy it now and shipping miraculously jumps up to $3.69. Sneaky buggers. I’ll bet most buyers don’t look and just pay the misleading shipping charge. Not for me, just out of principle.