Found them!

These look like the direct replacements I need, and do come with the option of the M8 threaded stem!

And such an obvious website too (bookmarked). I will get the office to order a couple of buckets full.

https://www.castors-online.co.uk/product/65mm-floor-kind-office-chair-castors-4464

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I am looking for replacement castors for conference tables. Anyone have any good supplier site I could look at please.

They need to be like this, about 70mm tall installed, but with an M8 threaded pin. and not silly money as I will be sourcing possibly 40 of them.

Any pointers will be much appreciated.
Thank you.

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