Havent got the part number to hand... But basically iso adaptor came today, which happened to be wrong. Id guess it was maybe for a non bose setup. Looked like one massive plug, rather than what i have. Which conversely, after looking, i dont even need really, as my A3 04 has an iso plug already for the power side of things. With the aerial, ive plugged the square (fakra?) plug into the car, which has a silver tube on it, then a normal aerial lead comes out of it, which is into the headunit. This leaves the standard stubby aerial lead un used though, is this right ? I was expecting to have to plug that in to my headunit via a normal aerial adaptor, and the fakra thing was just for the amplifier ?