Setting values and names for options_for_select

looked around but nothing that is perfect I can find.

I have an array of @agents and want to display them in a multi select form. Currently I have:

        <%= f.select(:agents, options_for_select(@agents), {},{multiple: true, size: 10}) %>

Which shows this:

I want to chose what to display in the select and possibly have a checkbox if possible?

Attributes are accessible via

<% @agents.each do |a| %>
  <%= a.id %>
  <%= a.name %>
<% end %>

I want it to look as follows:

Best way for me to do this? Thanks!