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But weight and strength aren't. The OEM are lightweight forged or spincast. Pretty good stuff. Aftermarket are cast -- by no means unusable, just not quite the same as the OEM.
Dunn, can’t tell precisely from your pic. You may need to pull a wheel and check the markings on the back. I say this because it is true that the black finish isn’t OEM, but an OEM wheel could have been refinished- exactly something that I did and they looked very similar to your pic.