I few of the posters here seem to be missing the point. 6mm SS washers are very common and blacksquid is not talking about acquiring a standard 6mm ss washer. The problem is finding a ss 6mm thin walled washer; one that will fit into the recesses in stems. I have bought numerous fasteners from Bolt Depot and while they are a great place to do business with, they do not carry thin walled washers and I've yet found anyplace that does. I have actually stooped to drilling out washers when I had no other choice; if your lucky you will get a good one every 2 or 3rd try