35mm ID x 39mm OD x 2mm thick O-ring. JIS S35.5. Buna-70. Quan 2. | eBay
Caterpillar CAT OEM O-Ring Seal 5B-3718 [Lot of 7] NOS – governmenttransitsurplus.com
O-ring Sealing Ring Guard Coil Series Coil Set Rubber Wear-resistant Oil Resistant Waterproof Nitrile Rubber Ring - Temu
Ekena Millwork CR39ME 39 3/8"OD x 35 1/2"ID x 2"W x 7/8"P Medway Ceiling Ring (1/4 of complete circle)
Remote Sensing | Free Full-Text | Monitoring and Analyzing the Effectiveness of the Effective Refuge Area of Emergency Shelters by Using Remote Sensing: A Case Study of Beijing’s Fifth Ring Road