This is the newest one I've seen for the AT4s that states it's compatible with MRC. Here's the link to both.
https://www.readylift.com/3-sst-lift-kit-2021-2022-gm-suv-2wd-4wd-w-magnetic-ride-control.html
https://www.readylift.com/3-sst-lift-kit-2021-2022-gm-suv-2wd-4wd-w-magnetic-ride-control.html