The replacement Maxle for the 2019 Boxxer C1 is part number 00.4318.027.000 (AXLE MAXLE DH FRONT MTB 20X110 BOOST, LENGTH 158MM, THREAD LENGTH 10MM, THREAD PITCH M20X1.50 - BOXXER C1+D1+ (2019+)).
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