GE Universal 3.5mm Audio Adapter, Car Cassette to Headphone Jack in Black 34496 - The Home Depot
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Before USB ports and CD players, there was the cassette player. And this. : r/FuckImOld
Fixing the Automatic Reverse Flipping of a Cassette-to-Aux Adaptor - iFixit Repair Guide
Amazon.com: Monster Aux Cord Cassette Adapter 800 - iCarPlay for Car Tape Deck, Auxiliary To Dashboard, MP3 Player, iPod and iPhone - 3 ft Black Cable : Everything Else