Try calling your tech?
We had same problem finding our capping station sponge pads for the mutoh Toucan LT. Our normal supplier couldn't figure out what we were trying to describe and kept sending us the standard maintance kit with the stick spunges...but that wasn't what we needed.
Our tech finally figured out what part it was.
Don't know if this helps but our head sponge pads came in a box called head cleaning kit.