No, the 2024+ SIDLuxe ISOSTRUT A1 shock can not be converted to Flight Attendant. The complete shock must be replaced with part number 00.4118.546.000 (Rear Shock SIDLuxe IsoStrut Flight Attendant(239x40) SoloAir, 0Token,Reb57/comp25,Mid5,Lockout8 A2 - Trek Supercaliber 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