Amazon.com: Hysagtek 50 pcs Metal O Ring and D Ring, Non-Welded Metal Rings Multi-Purpose Buckles for Bag Straps, Belts, Macrame, Pet Collar Leashes - Silver 15mm, 20mm, 25mm, 32mm, 38mm : Arts,
OR32X5 Nitrile NBR Rubber O Ring 32mm ID x 5mm Cross Section | eBay
Viton O-Ring - 5mm Wide 32mm ID - Pack of 2 - Walmart.com