I am fairly certain there is a Honda OEM O-ring that is the same size, but you have a couple of other options.
You could buy this kit, which includes an O-ring that will work.
https://www.aliexpress.com/item/1Set...ceBeautifyAB=0
Otherwise, if you can measure the inside diameter of the O-ring, and a rough thickness I can try to hunt down a Honda part number that will work.
That, or head to your local parts store and try to match up an O ring that can work.