There was a card in the retail box that you could send in and get 1.2M or 360K disks. I should have a set around here somewhere.
edit: I have the 6.0 upgrade and the 6.2 upgrade on 360K disks, but not the 6.22 step-up. Unless it's in a different box.
I migrated 6.22 onto 360k disks from another install.