Dropper post nightmare

I have a 2021 Trek X-Caliber 8 and want to buy a dropper post, but its a nightmare finding one that will fit, the only thing I can see if the Oneup 120mm Dropper which is out of stock everywhere.

My tube bottoms out on the internal hosing for a 2nd bottle holder 19cm into the tube, my total overall length is 35.5 from the bottom of the tube to the seat rails.

Can any-one help?

Cheers

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