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Set of H&R 40mm wheel adapters (some call these spacers).
Ran these on my 2009 Carrera 4 which was a wide booty. Using these I was able to run wheels from a base 997 car on my wide body car - the fitment was bang on in terms of wheel to fender edge position.
These will open up your wheel options, for example, should you be considering winter wheels for your car, you can use base car rear wheels which will use slightly narrower tires - good for snow.
Some may be afraid of spacers, but if you research RL you will find they don't present any problems at all. I ran these with no vibrations or issues.
They are hub-centic; bolt them to your hubs with the bolts provided, then just bolt your wheels on as usual. Quality German made.
They were $137 USD, plus shipping, plus all the other costs getting them across the border.