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The purpose of the bowl is so that it matches the contour of the bolt seats on your wheels. Stock Porsche wheels have what is called a ball seat. Many aftermarket wheels for Porsche also have ball seats. But some have tapered seats. This is why the seats are separate from the bolts with your aftermarket spacers, so the spacers can work with ball seat or tapered seat wheels by just supplying the correct seats.
Without the correct seat all of the force for holding the wheel is on the rim of the bolt and the bolt itself in shear. Not only will this result in vibration and potential damage to the wheel but can also result in bolt head failures. Always make sure that the seat contour of your bolts (or nuts) matches the seat contour of your wheels.
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