I ended up mounting a Pioneer SPH-DA360DAB with wireless Apple CarPlay in the Smart Fortwo, instead of the old-school Smart Radio 9
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Chevrolet Stereo Upgrade parts, Radio replacement kit, Audio fitting kits, Car audio cables, Amplifier intergration, Antenna adapters, Steering control interfaces for Alpine, Clarion, JVC, Pioneer, Kenwood, Sony or other aftermarket stereo upgrades