TL

“Where is one verse that tells husbands to submit directly to their wives?”

Ephesians 5:1-21 is addressed to all Christians in Ephesus, and indirectly to all Christians everywhere. It is not necessary to make a list of all ages, nations, and classes of people that “all” includes. All/Everyone includes husbands and wives. This goes for verses 1-2 as well as verse 21. So even though Paul does not tell wives specifically to love their husbands and does tell husbands specifically to love their wives, this does not mean that wives don’t have to love their husbands in the same way that Christ loved and loves us. And when Paul says that that we “Christians” are to arrange ourselves under one another in the fear of the Lord, that includes all ages and all classes of people. And it has nothing to do with authority.