Yes, the travel of the 2019 Boxxer C1 can be changed using any of the air springs listed below.
00.4019.933.000 AIR SPRING KIT - DEBONAIR 200MM (INCLUDES DEBONAIR ASSEMBLY, SEALHEAD) - BOXXER C1-C2 (2019-2023)
00.4019.933.001 AIR SPRING KIT - DEBONAIR 190MM (INCLUDES DEBONAIR ASSEMBLY, SEALHEAD) - BOXXER C1-C2 (2019-2023)
00.4019.933.002 AIR SPRING KIT - DEBONAIR 180MM (INCLUDES DEBONAIR ASSEMBLY, SEALHEAD) - BOXXER C1-C2 (2019-2023)
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