Replacement filters. I have spent hours on the phone and on-line trying to find a replacement

Question

I have spent hours on the phone and on-line trying to find a replacement filter for my Delonghi "Easy Clean System" deep fryer model D680-C

One site says that the FK6 filter replaces all D6 models however, every other site I've been on quotes specific models for this filter which do not include D680-C

I have checked all local sources as well with no luck. It seems a simple question but I have spent many fruitless hours trying to find an answer and am no further ahead. HELP!!!!!!!