Filtrar archive.php por custom post type

Tengo este codigo en el function.php el cual me crear la lista de los meses en los cuales se han creado post asi:

function twentyeleven_get_archives_callback($item, $index, $currYear) {
    global $wp_locale;

    if ( $item['year'] == $currYear ) {
        $url = get_month_link( $item['year'], $item['month'] );
        // translators: 1: month name, 2: 4-digit year
        $text = sprintf(__('%1$s %2$d'), $wp_locale->get_month($item['month']), $item['year']);
        $text = substr($text,0,3);
        echo get_archives_link($url, $text);
    }
}

function twentyeleven_get_archives() {
    global $wpdb;

    $query = "SELECT YEAR(post_date) AS <code>year</code> FROM $wpdb->posts WHERE <code>post_type</code> = 'post' AND <code>post_status</code> = 'publish' GROUP BY <code>year</code> ORDER BY <code>year</code> DESC limit 4";
    $arcresults = $wpdb->get_results($query);
    $years = array();

    if ($arcresults) {
        foreach ( (array)$arcresults as $arcresult ) {
            array_push($years, $arcresult->year);
        }
    }

    $query = "SELECT YEAR(post_date) as <code>year</code>, MONTH(post_date) as <code>month</code> FROM $wpdb->posts WHERE <code>post_type</code> = 'post' AND <code>post_status</code> = 'publish' GROUP BY <code>year</code>, <code>month</code> ORDER BY <code>year</code> DESC, <code>month</code> ASC";
    $arcresults = $wpdb->get_results($query, ARRAY_A);
    $months = array();

    if ( $arcresults ) {
        foreach ($years as $year) {
                    //My Display
            //echo "\t<li>\n\t\t<a href=\"#\">$year</a>\n\t\t<ul>\n";
            //array_walk($arcresults, "twentyeleven_get_archives_callback", $year);
            //echo "\t\t</ul>\n\t</li>\n";

                    //Your Display
            echo "\t<div class='listYearArchive'><span class='yearArchive'>$year</span>\n\t<ul class='listMonthArchive'>\n";
            array_walk($arcresults, "twentyeleven_get_archives_callback", $year);
            echo "\t</ul></div>\n";
        }
    }
}

2015 nov dec
2104 may nov dec

«nov» «dec» son link el cual me muestra en la url: http://www.xxx.com/2015/11 los post de esa fecha.

Esto usando archive.php

La pregunta es: como podria hacer esto mismo pero filtrando estos link por custom post type ??