Yes, the travel of the 2024+ Boxxer D1 can be changed using the part numbers below.
00.4318.085.000 Air Spring Upgrade Kit - DebonAir+ w/ ButterCup 200mm (includes air shaft assembly, Jounce Bumper, and ButterCup) - 38MM BOXXER D1+ (2024+)
00.4318.085.001 Air Spring Upgrade Kit - DebonAir+ w/ ButterCup 190mm (includes air shaft assembly, Jounce Bumper, and ButterCup) - 38MM BOXXER D1+ (2024+)
00.4318.085.002 Air Spring Upgrade Kit - DebonAir+ w/ ButterCup 180mm (includes air shaft assembly, Jounce Bumper, and ButterCup) - 38MM BOXXER D1+ (2024+)
RockShox service kits and spare parts are best obtained through your local shop or dealer. See our dealer locator, below, to find a dealer near you. If no one is currently listed near you, then please search for local shops via your preferred web browser.
https://www.sram.com/en/dealer-locator
Manuals and additional information about RockShox and SRAM components can be found at our service site, linked below.
https://www.sram.com/en/service
Further questions?
Reach out to Rider Support by Asking A Question at the link below.
https://www.sram.com/en/rockshox/campaigns/rockshox-rider-support