New to the forum (2003 986)

[Ian c]

Bear in mind not all spacers are the same .
I'll only ever use top quality spacers from ruf h&r genuine porsche
They must be quality and hubcentric or you'll suffer from no end of wheel wobble problems .
I have plenty of sets and will only use these 3 makes on my p-cars

Going by memory (some are already fitted on my cars and the others are in a box somewhere in my garage) ....
The genuine porsche 5mm and h&r and ruf 7mm are not Hub enteric but are small enough to use the existing hub and have a hole to fix using the existing counter-sunk screw .

The next size up is 14mm hubcentric h&r , 15mm hubcentric ruf , 17mm hubcentric porsche . And these are really "adapters" rather than "spacers" as they bolt on and have studs to mount the wheel to .
Anything I have bigger than that us not suitable in a "normal" 986 scenario .

Note there is nothing around 10mm as around this measurement you're in the grey area between having enough of the existing hub to hold the wheel center and having enough spacer to add a "new" hub .
Although I recall having a set of ruf 10mm hubcentric spacers in my box ..

If I have time on Sunday I'll go hunting in the black hole that is my garage and post pics and confirm everything I've just written from memory