Dt125R 2004 back fender
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@lukas2105 DTR? Or do you mean DTRE?
The DTRE/X fenders interlock with the rest of the fairing, so swapping out the rear fender results in the side panels not fitting.
The DTR panels differ and as a result it used to be a common mod to fit the Hpires rear fender to a DTR.
https://www.bikerpartshop.com/en/home/24-rear-fender-mudguard-cross-for-yamaha-dtr-125-200.html