Yes, the 2026+ Reba Gold/RL B1 is compatible with part number 00.4318.103.000 (RockShox MTB Fender Black Short Trail 3 Bolt - Reba (B1/2026+) Psylo (Full Fender/ABS Lower Leg only) (A1+/2025+)).
Fender mounting bolts are M3-.5x11.5mm (qty 2) and M6x9mm (qty 1).
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