1200 strut tops in 120Y lower the car by 30mm. 120Y's shock mount is 25mm under the strut tower, and the 1200's is 5mm above. Ride height changed exactly 30mm. need to cut the centre hole out from 80mm to 94mm diametre. 1200 studs are 8mm versus 120Y's 10mm, so you need washers underneath the nuts.