Yes, replacement CSUs are available for the 2018-2022 Revelation.
27.5”:
11.4018.008.579 FORK CSU - DEBONAIR 27 46OFF-SET TAPER DIFFUSION BLACK (NO GRADIENTS) - REVELATION A1 (35MM) (2018-2022)
29”:
11.4018.008.581 FORK CSU - DEBONAIR 29 51OFF-SET TAPER DIFFUSION BLACK (NO GRADIENTS) - REVELATION A1 (35MM) (2018-2022)
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