I found another thread a few days ago about this same subject. It mentioned another source with a bit different sizing so I ordered these also.....

Fastener-express.com

part number Description
31314 Stainless flat washer #0 NAS620 MFG part # FWSO-7A3
31283 Brass Flat washer MFG part # FWBO-7C2

another option for the inner thin brass washers is to use a paper punch and punch out using thin brass shim stock then drill a hole in the center.