Amazon.com: (1500pcs) DIN 9021 M8 Washers (8.4mm ID) OD ~ 3 x Screw Dia A2 Stainless Steel Ships Free in USA by Aspen Fasteners : Industrial & Scientific
50 PCS 304 Stainless Steel Flat Plain Washer Spacer, M8 Screw Size, 8.4 mm ID, 17 mm OD, 1.5 mm Thick: Amazon.com: Industrial & Scientific