8Jx17ET70 and 9Jx17ET70 on 97 C4S

[dangeruss]

Hi,

I just got 993 Carrera Cup II's for use on my 97 C4S. The sizes are 8Jx17 ET70 (Front) and 9Jx17 ET70 (Rear).

The front wheel hits the spring. The stock size for my C4S is:

Front 8Jx18 ET52
Rear 10Jx18 ET40

What size spacer should I be using?

Thanks in advance.