Adding Australian specific address fields to Gravity forms

gforms-aus-address

add_filter("gform_address_types", "aus_address", 10, 2);
function aus_address($address_types, $form_id)
{
    $address_types["australia"] = array(
        "label" => "Australia",
        "country" => "Australia",
        "zip_label" => "Postcode",
        "state_label" => "State",
        "states" => array("NT" => "NT", "ACT" => "ACT", "NSW" => "NSW", "QLD" => "QLD", "VIC" => "VIC", "WA" => "WA", "SA" => "SA", "TAS" => "TAS")
    );
    return $address_types;
}

//Modified from http://www.wpsites.co.uk/468-gravity-forms-adding-uk-specific-address-field.php