I bought one for my Prototipo. The assembly didn't fit, so I pulled it apart and removed the horn tin. I put the tin inside a Momo horn assembly, and installed it in my wheel. The tin is just a hair too big for the Momo casing. It fits, but it's a little tight when reassembled.
The graphics aren't the greatest. As you may have noticed there are several different versions of the Porsche logo. I'm guessing this one must be the most recent, but I confess that I'm not exactly an aficionado of Porsche logo history.
Oh, and is it just me, or do these cars have the most dorky sounding horn ever? It's like a silly clown car horn or something.