Need part number - o-ring for cylinder deactivation OCV (2018 CX-5)

Hi all, New member, hoping somebody can help me. I took over ownership of my daughter's 2018 CX-5 with CD (not sure yet this is a good thing...) and I'm doing the timing cover re-seal TSB myself. Does anybody know if the o-ring on the cylinder deactivation OCV is available separately (see attached photo)? I've looked everywhere and it appears the o-ring is supplied only with the OCV itself, which I don't need of course. I can size my own I suppose (it's green, so Viton or similar) but I'm ordering a bunch of parts anyway and OEM would be easier.

Thanks in advance!
 

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