Apex Lowering springs

Hi Hope someone can offer me some good advice on this one as i am sure somebody must have come across this b4

I have bought some Apex lowering springs for a Golf 1984 Karman GTI which will lower by 30-35mm
the wheels i have on the car are 15 inch 7j with a ET of 25 what i need to know is will they rub anywhere .
i have measure between the tire and the arch and have about 50 mm at the moment so would be left with 15-20mm

if these are going to rub im not going to bother and can any one recommend a alternative which would give me the clearance.

thanks for looking