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The Green O-ring is most likely an HNBR O-ring? https://www.canyoncomponents.com/hnbr-hydrogenated-nitrile-o-rings-gaskets

https://www.canyoncomponents.com/as568-sizing-charthere is a link to a really nice O-ring chart.

I found that these guys are the most knowledgable about O-rings. https://www.canyoncomponents.com/as568-sizing-chart

Viton 90 durometer seems to be the best choice, its available in any size from tehse guys. https://www.canyoncomponents.com/fkm-viton-fluorocarbon-o-rings-gaskets They also have a very handy sizing chart, I printed and hanging on the wall. https://www.canyoncomponents.com/as568-sizing-chart