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I actually have a longer tube somewhere - it came with a shallower drip tray.
Unfortunately the drip tray itself was 3D printed and didn't survive a trip through the dishwasher.
... turns out that drip tray is still available, now more durable than the one I destroyed, and that you can get the tube on its own from here:
https://www.shadesofcoffee.co.uk/stainless-steel-long-vent-tube-6mm-od-x-5mm-id-x-158mm
Longer as in, down to the drip tray? Why would you need longer than the stock one?
Loads of places have replacement, off the top of my head it's 5mmID 6mmOD if you want to roll your own.