Amazon.com: (4 Pack) Neoprene Rubber Washers - 1 1/2" OD x 3/8" ID x 1/4" Thickness - 60 Duro Primal23 Industrial N60 Series Rubber Washers : Industrial & Scientific
100 Pack) Oil Resistant Neoprene Rubber Washers 1/2" OD x 3/16" ID x 1/16" Thickness - Endeavor Series Sealing Rubber Washers: Amazon.com: Industrial & Scientific