Want to Buy Leitz Focomat (diffusor) adapter for ILFORD MULTIGRADE 500H HEAD (see photo)

I'm looking for a adapter that let's you fit the Ilford Multigrade head directly on to the Focomat 2c (without the condensor)
normal you see the head on top of the condensor but I would like to print with a diffusor instead ...
I don't know if they were made by Ilford or that a third party made custom adapters (like Kienzle) ?

if you got one or know how to get one, I would be great full ;-)