You know, swinging by your local Porsche dealership and asking the parts counter person if you can have a look at a set of 5mm spacers (if in stock) would probably allow you to do your own measurements.
I know my parts guy would be happy to do this for me if I asked and he had the time to do it. Just an idea.
BTW - If you figure out how to do it and you can fabricate them easily, I'd say you should be selling them on Ebay to fund your maintenance and upgrades for your Boxster!
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