The BoXXer D2 uses the same fender as Boxxer D1.
00.4318.077.000- AM AC FENDER BOXXER 4 BOLT BLACK RockShox BoXXer Fender Black 4 Bolt 38mm - BoXXer (D1+/2024+)
Your local shop or dealer will be the best resource for ordering a compatible fender. See our dealer locator to find a dealer near you: