1966 Barracuda AM/FM radio part number?

ZooKypr said

This would be the correct one for a '66 Barracuda?

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Yes.

Would it look exactly like the one pictured by 1969CUDAMAN in his 1965 Barracuda?

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Since I don't know exactly what his is, I can't say.

Also how would you accommodate the third wire?

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What third wire? I suppose I'd probably…connect it to where it needed to go!