Having a mother who now has to rely on this type of walker for assistance I noticed 1 foot was missing. Worried just not off the floor but also the uneven footing plus glide of walker I modeled this from the one remaining. It does take a bit of tapping to seat properly which also ensure they won't come out.
EDIT: Added 2nd file (V2) with a .1mm tolerance for the leg, easier to put on by hand, also added 5mm inside hoping it will help in the wear on concrete.
The author marked this model as their own original creation.