Eibach Sportline Lowering Springs Kit. Seat Ibiza V (KJ1). Ibiza V (KJ1) 1.6 TDI from 11.2017 Diesel 59/80 35-40 mm 40 mm. By radically lowering your car’s center of gravity, our Sportline springs dramatically reduce squat during acceleration, body roll in corners and nose-dive under braking.