The difference is less parts, upgraded the cable material and the attachment to the body sensor was improved.
You reuse the lower lever, and the rod nuts. There is a new shorter rod, and the upper lever.
In some FB group a guy claims he installed the '22 QS to a '21 AT, and it was a direct fit.
I asked him to make a post about it, to confirm and show everybody.
Mi AT is a 22, and I installed.
Great Gadget. Very Happy.
You reuse the lower lever, and the rod nuts. There is a new shorter rod, and the upper lever.
In some FB group a guy claims he installed the '22 QS to a '21 AT, and it was a direct fit.
I asked him to make a post about it, to confirm and show everybody.
Mi AT is a 22, and I installed.
Great Gadget. Very Happy.