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Thank you for the offer, mine is also an Orange post and those fittings look identical (ID of the tube ~26mm as best as I can tell) so may have done the trick. It actually raises new questions though: I can't get enough clamping pressure to prevent the aluminium parts rotating in the steel outer tube. I thought the indentations in the lower section were deformations caused over time and were the culprit but it now looks like they were intentional. I have made a crude shim out of a piece of steel which increases the diameter - any better suggestions? The shim works but is just a pig to install.
Dang, missed it, but I imagine you're right about the relative cost. Just a shame to toss it.