Got it today... but didn't get a call 1st so wasn't prepared. I've been following your thread. I'm pretty sure there isn't a holder on 25 litre.
I've set up the RO system. It's all a bit much at first, but I'm getting there now. Just waiting to start producing pure water as there is a 2 hour running time to flush the cylinders.
I note you went for the extension hose. Especially if you have the shut off valve on the pole, that seems a good idea.
I'm sure you'll get yours soon. Best of luck with it.