I printed this using two different processes, so the top part (the side touching the printer) was denser (40% infill) and the bottom part (the side touching the table) was less dense (15%) so it would be softer. They are also 5mm taller than the stock feet. They are a direct replacement and require no additional hardware. Unscrew the existing feet and then screw in the new ones.
Disclaimer: I have an early FFAD5MP and do not know if they changed the design later. These feet work with my model of FFAD5MP, but YMMV.
The author marked this model as their own original creation.