My Barcelona 200 DAB BT has already stopped working :-(

I have no idea, I have a Mercedes A class, they don't need any standardised plugs.

Suggestion: remove the old radio and take a photo of what it needs, then look at the various connectors on the computer,
I have for my 2011 Polo from Galaxus under: Car radio installation, an ACV specific connector cable for Audi. Seat, SK Quadlock connector used.
On the photo you can clearly see the 2 small plugs that go into the Barcelona. RT.

Unfortunately, I can't answer that either.
LG Manfred

My vehicle is 40 years old, so I've adapted the connections to the plug supplied.

Hello Claudio
Unfortunately I can't tell you, as I needed this device for a BMW Z3.
Google can certainly help.

I would have a look at it first. Normally you don't need an adapter. These years should already have Iso plugs.