Having it already Weber equipped is a score, and that does appear to be a genuine Weber.

Curious it appears to still be using the stock-type mechanical fuel pump next to the carb, as those typically push more pressure than Webers prefer, and down-regulating the pressure tends to cause premature pump failure.

If that filter element media is just foam, you should be able to clean it out with a water-soluble degreaser like Simple Green or the purple stuff.

Otherwise, you can search K&N reusable elements by dimension here:
https://www.knfilters.com/search/universal

If you'd prefer to duct intake air from a cone filter in a cooler-air location, plenum adapters for that are more typically made for the Weber DG(E)V, but I found this one suitable for your DFEV:
https://www.ebay.com/itm/283759965463