I've had (still got) a serious 3DV habit and a collection of (NOS) Grafton/Ringle kit left over from my Yeti Build and also the Ozone CO2 see signature below,
I have NOS pods and a NOS Moby however I think the Moby is 27.2mm as I was going to shim up to 31.6mm however I needed a bit of extra room and ended up with a layback Thompson instead.
I've no massive desire to part with them, but equally they will sit collecting dust for the next 10years
I can post some pics if your interested and also check on the diameter of the moby to confirm
(if it was Yeti size, 26.8mm I'd have it in a bank vault)