You were right. Found this for the eibach pro kit springs
Eibach Pro Kit – Volkswagen Golf MK8 GTI/GTD
Lowering:
15-20mm Front
10mm Rear
Not suitable for clubsport models or cars spec’d with 19″ wheels with the mandatory sports suspension package (this kit will fit but will NOT lower the car) If...
When you select 19" in configurator it changes the suspension to sport, so the 18" base GTI has different dampers?
Sport Suspension for 19" wheels
—GTI front shock absorbers
—GTI rear shock absorbers