Is that a Laeger ProTrax front end? And a no-link swingarm?
Your best bet would be to call Fox (or any other shock manufacturer) and/or the a-arm and swingarm manufacturer to see what they would recommend. Alternatively, you could ask the shock manufacturer was measurements they need to build the correct length shocks, typically shocks removed with frame 1.5” off the ground and then with the frame 12” off the ground. Note that this process would be used to determine both the front and rear shock lengths.
For some reason, 19.25” sticks out in my memory for long travel Laeger, but you will want to have that confirmed.
Thank you very much for answering!!! it is Laegers and No link, yes. On the Fox website I don't see that it manufactures specifically for this model, but I have seen that several TRX (for example Michael Sabo) mount them for the front axle. Not for the rear. I will try to take the measurements as you tell me and see what comes out....