If you can't find a 84/85 module, I happen to have a conversion kit to a 86/87 style module complete with the metal mounting bracket. It was included in a bulk parts purchase I made a few years ago. I don't have a hot air car so I have no use for it and more importantly I CANNOT GUARANTEE IT WORKS because I am unable to test it. But if you want to try it I'll send it out to you. Here is a pic of what I have:
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