10 x Black Nitrile Rubber O Ring Grommets Seal 36mm x 40mm x 2mm : Amazon.co.uk: DIY & Tools
Amazon.co.jp: DINGGUANGHE CS1.2mm Silicone O-Ring OD 16/19/18/20/22x1.2mm Japanese VMQ Gasket Seal Thickness 100PCS White Red Rubber 1.2mm Logical Gasket, Ring (Size : OD18x1.2mm Red) : Industrial & Scientific