Want to Buy Leitz focomat 2C difuser adapter

I have two Focomat 2C enlargers (lucky me)
on one I’m using a Heiland Splitgrade head
and on the other an Ilford 500H multigrain head

recently I found out that there is also the option to replace the condenser with a difuser
any one know about this, or better, has one for sale ?
(See photo)

thanks for the effort

Anyone ever seen this type of adapter ?