FORM A FLAT BLACK THICK NEOPRENE RUBBER WASHERS - M3 M4 M5 M6 M8 M10 M12 M16 M20 | eBay
Everbilt 1/4 in. x 5/8 in. Black Neoprene Washer (4-Piece) 815738 - The Home Depot
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
Neoprene Flat Rubber Washer Spacer - 2" OD X 1" ID X 1/8" Thick | Rubberfeetwarehouse
1-1/4" x 2-3/8" x 1/8" Neoprene Rubber Large Flat Faucet Washers — Fastener Line