I have 15mm front and 20mm rear spacers, sit dead square with the arch.
My fronts and H&R and the rear are ebay, both are bolt through type and i have zero issues. I did have issues with the bolt-on type that I had on the back for a while so i'll never use them again.
Tbh i wish Porsche would order their wheels in a proper offset, that would be far better.
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