have you looked at Crutchfield yet....
https://www.crutchfield.com/S-5pU2J5mYFF0/g_119400/Car-Antennas-and-Adapters.html
So it's the Motorola adapters the ones to look for? Have you used them?^^^ That's the one, I couldn't remember what it was called. Look for "motorola" antenna adapters, that's the technical term for the coaxial barrel style on the old radios. I thought it was still in wide use(!)
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