Dropper post might hit 2nd bottle mounts

in MTB general
Hi, first post and a new bike to boot. I’m wanting to buy the X- Brand dropper post for my 2021 Trek X-Caliber 8, I’ve just measured from the seat rails to the top water bottle mount (which also sits inside the tube) and its around 38cm, the total length of the dropper post is 41cm for the 125mm version. I am I looking at this wrong or won’t it fit to my desired height?
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Measure your current seatpost in normal position from the middle of the saddle rail clamp to the top of the seat post for stack height.
Compare your measurements with the max insertion depth and stack height of the dropper post.
Be aware the max insertion measurement may include the actuator at the bottom if internally routed which may be a factor with overall length so it could possibly still fit.
You may find that you won't need to fully insert the dropper for the saddle to be at the correct height for you when in the fully raised position. If the 125mm won't fit you may have to settle for a 100mm dropper.
Chain Reaction Cycles list all the measurements for the Brand X if you scroll through the images on the listing.
So removing the bolts didn't work or something inside still restricted the max insertion depth?
https://www.leisurelakesbikes.com/331303/products/oneup-dropper-post-remote-v2-black.aspx?currency=GBP&chosenAttribute=1C0577&gclid=EAIaIQobChMIsYCIxo-Z6wIVCLrtCh1FJQ_lEAQYASABEgIqJPD_BwE
Nice but a bit pricey although you could use any cable operated lever as long as the shift cable end threads through it and anchors with a grub screw, (bottom up routing)
https://www.mbr.co.uk/how-to-2/mix-dropper-remote-lever-378762
The unit itself is convertible to the I-spec and Sram standards so in the future you should be able to buy conversion kits if you decide to upgrade brakes.
The Oneup lever sold in the U.S. comes supplied with the inner and outer cable too. Although it doesn't state if cable is supplied on Leisure Lakes maybe worth emailing or waiting to see if there is one in the box before you buy shift cables.