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Pulled this out of a junkyard Delta 88 many years ago. Have no idea if it works. Or maybe its stereo not reverb. As the guy on Vice Grip Garage says, "I don't know". $150 plus shipping. Buttons and face are kind of green. No *****. GM info decal gone.
That's a stereo multiplexer tuned to that radio. Sell as a set. You can see the word stereo in between 90 and 110 on the AM band in the second picture.