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None available in 31.6 diameter at the minute.
So I’ve been measuring all afternoon, the furthest I can put a post into my frame is 21.5cm, and with my current saddle I’ve got 26.5cm from seat clamp to saddle rails.
I think 150mm is safer because 125mm leaves me right on the edge of minimum insertion.
Could you not get something like the One Up dropper in 150mm and then shim it down if it's too long?