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Ericson said..Posting from my phone. Sorry if it is not formatted well. Hopefully the picture shows. See the little Nick on the O ring? It's a 2015 Ozone Reo. Is this bit easy to remove and replace?

I buy O-Rings of various sizes from my local bearing place, if you pull that one out with a crouchet hook or similar blunt hook and take it with you they should be able to match it. O-Rings are usually measured in OD (outer diameter) and thickness. If your local kite shop can't supply them they may be able to give you the specs, that looks like a 30x2,5mm judging by the pics but best to get specs if you can or take it with you.