147 JDT pair questions.

Hello together, so today at half 1 I pick up my 147 JTD (42t km,115hp) and have a few questions in advance. 1.) In the car is a Din1 radio and under the radio is a compartment (approx. also Din1 size), I have here from Maqma still a Din 2 radio which I would like to build.Can I easily with a Din2 aperture or is between radio and storage a strut ?? 2.) Since the operating instructions is in Italian and I don’t really look through (typically Schwabe ) I wanted to ask like you can set BC to liters/km, that’s what I found in the BC already because you could set something with l/100km and km/l or something like that.No idea how exactly that worked. Pictures of the flicker are still coming. Lg Tobi PS:On the picture is a picture of such a BC, no idea if there are different but I have.