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Turkish
You should be able to get a replacement assembly from a Trek dealer or I guess someone who does Envy stuff?
https://www.tritoncycles.co.uk/components-c9/seatposts-seat-clamps-c86/seatpost-single-bolt-rotary-head-parts-kit-p6284
or possibly a more modern version (and it comes in black also!) No idea if this one would work though, caveat emptor
https://en.ciclimattio.com/s/bontrager/seatpost-head-parts-2017/?id=18742&m=28873