the dash ones by the window are a well dodge size, are they 10 or 8cms? correct me if im wrong, but look bigger than they are anyway, some of my mates have bought 13cms and had some fitting problems. The mk3s have that pretty much sorted though as they (or mine at least) have factory fit tweeters in there, which are going good so far, wouldnt want to blow them though as fitting new ones (or disconnecting the old ones even!) will be quiet a task ( no screws visable! )