Joe,have you considered a complete stock 7" headlight with chrome steel headlight bucket and rim assembly;this one has the H4 halogen with replaceable H4 55/60wt. bulb,so you won't need to replace the entire,large headlight bulb when you blow a bulb.
I have this complete headlight assembly in beautiful condition if interested. Take a look at pictures of a 1982' Honda CX500 Custom and check out the headlight,then you'll see the one I have;the chrome bucket has no rust at all,shines like new.