The only air can available for the 2012-2014 Monarch XX A1-A2 is part number 11.4115.106.020 (REAR SHOCK AIR CAN - 165X38 - MONARCH/PLUS RC3/RT/R(2011-2013) MONARCH RT3 (2011-2012)). This air can is only compatible with the 165x38mm shock.
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