I have recently has the radiator replace on my A4 1.8 SE. The new radiator has a notch type step situated in the centre of the top edge. I had asked for the old one back from the garage and this is straight along the same edge. Could someone tell me if the wrong radiator has been fitted or has there been a design change to the radiator? The garage had the car for longer than expected because they originally ordered the wrong type.