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I don't know if they're the same as the 957 ones, but I have an all aluminum one from a 957 turbo S driver's side (sold the passenger side already). It in almost new condition as I removed them at 28k miles when installing larger fvd ones as part of my build. Cleaned in my heated, ultrasonic parts washer.
If it will fit, maybe you can find just the passenger side on eBay or DC Automotive or somewhere.