Why not get the bontrager one? They probably work alright in a Trek
https://www.trekbikes.com/gb/en_GB/equipment/bike-accessories/bike-mudguards-and-accessories/bike-mudguards/bontrager-ncs-mudguard-set/p/21832/?colorCode=black
Trek recommends these. Would rather get metal ones probably.
@frankenbike started
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Why not get the bontrager one? They probably work alright in a Trek