I doubt if you'll find a pot as big as that Tambo :o(
I can't seem to find the 600mm (2') long plain pipes on Google. I haven't used them for years, so maybe they've been superceded by the "spigot & socket" type now. Trouble is, these are about 8' (2500mm) long. Easily cut, but wasteful 'because they're not cheap.
I think concrete or clay flue liners might be best. The concretes are 600mm long (if they haven't changed them as well)
The clay liners are usually 300mm, so 2 needed.