Hi Bigmundy,
The list of suitable urinals will be in the Gerberit brochure.
I'm sure that they make their frames only to suit their products.
As for the interrupter, this may be a piece that is put in the flushpipe to stop water spraying out over the edge of the urinal.
The picture you have shown, and I stand to be corrected, looks like it is a mains flush type.
( cisternless ).
If you are going to install one of these - see if you can get a full set of the installation instructions - and read and understand them thoroughly.
It may save you from having ' egg on your face ' or water during a flush ending up on the ceiling.
They can be very unforgiving if you do not do as the instructions inform you.