Clone sidebox manufacturers

Hi, I have new additional item for table products. Item is on base manufacturers include new table and clone manufacturers settings.
In shop I have clone manufacturer´s box and after clicking on selecting item I get link ie.: http://something.com/index.php?main_page=index&item_id=1. That´s right, but where is defined item_id=1 for browsing selected products? Now isn´t any results, but shop doesn´t know this item_id=1 or item_id=2 etc. only ie. manufacturers_id=1 etc.. I need modify others files?

Anyone? default_filter.php?

My changes:

  if (isset($_GET['manufacturers_id']) && $_GET['manufacturers_id'] != '' ) {
    if (isset($_GET['filter_id']) && zen_not_null($_GET['filter_id'])) {
// We are asked to show only a specific category
      $listing_sql = "select " . $select_column_list . " p.products_id, p.products_type, p.master_categories_id, p.manufacturers_id, p.products_price, p.products_tax_class_id, pd.products_description, if(s.status = 1, s.specials_new_products_price, NULL) AS specials_new_products_price, IF(s.status = 1, s.specials_new_products_price, p.products_price) as final_price, p.products_sort_order, p.product_is_call, p.product_is_always_free_shipping, p.products_qty_box_status
       from " . TABLE_PRODUCTS . " p left join " . TABLE_SPECIALS . " s on p.products_id = s.products_id , " .
       TABLE_PRODUCTS_DESCRIPTION . " pd, " .
       TABLE_MANUFACTURERS . " m, " .
       TABLE_PRODUCTS_TO_CATEGORIES . " p2c
       where p.products_status = 1
         and p.manufacturers_id = m.manufacturers_id
         and m.manufacturers_id = '" . (int)$_GET['manufacturers_id'] . "'
         and p.products_id = p2c.products_id
         and pd.products_id = p2c.products_id
         and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
         and p2c.categories_id = '" . (int)$_GET['filter_id'] . "'" .
         $alpha_sort;
    } else {
// We show them all
      $listing_sql = "select " . $select_column_list . " p.products_id, p.products_type, p.master_categories_id, p.manufacturers_id, p.products_price, p.products_tax_class_id, pd.products_description, IF(s.status = 1, s.specials_new_products_price, NULL) as specials_new_products_price, IF(s.status = 1, s.specials_new_products_price, p.products_price) as final_price, p.products_sort_order, p.product_is_call, p.product_is_always_free_shipping, p.products_qty_box_status
      from " . TABLE_PRODUCTS . " p left join " . TABLE_SPECIALS . " s on p.products_id = s.products_id, " .
      TABLE_PRODUCTS_DESCRIPTION . " pd, " .
      TABLE_MANUFACTURERS . " m
      where p.products_status = 1
        and pd.products_id = p.products_id
        and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
        and p.manufacturers_id = m.manufacturers_id
        and m.manufacturers_id = '" . (int)$_GET['manufacturers_id'] . "'" .
        $alpha_sort;
    }
  } elseif (isset($_GET['meritko_id']) && $_GET['meritko_id'] != '' ) {
    if (isset($_GET['filter_id']) && zen_not_null($_GET['filter_id'])) {
// We are asked to show only a specific category
      $listing_sql = "select " . $select_column_list . " p.products_id, p.products_type, p.master_categories_id, p.meritko_id, p.products_price, p.products_tax_class_id, pd.products_description, if(s.status = 1, s.specials_new_products_price, NULL) AS specials_new_products_price, IF(s.status = 1, s.specials_new_products_price, p.products_price) as final_price, p.products_sort_order, p.product_is_call, p.product_is_always_free_shipping, p.products_qty_box_status
       from " . TABLE_PRODUCTS . " p left join " . TABLE_SPECIALS . " s on p.products_id = s.products_id , " .
       TABLE_PRODUCTS_DESCRIPTION . " pd, " .
       TABLE_MERITKO . " m, " .
       TABLE_PRODUCTS_TO_CATEGORIES . " p2c
       where p.products_status = 1
         and p.meritko_id = m.meritko_id
         and m.meritko_id = '" . (int)$_GET['meritko_id'] . "'
         and p.products_id = p2c.products_id
         and pd.products_id = p2c.products_id
         and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
         and p2c.categories_id = '" . (int)$_GET['filter_id'] . "'" .
         $alpha_sort;
    } else {
// We show them all
      $listing_sql = "select " . $select_column_list . " p.products_id, p.products_type, p.master_categories_id, p.meritko_id, p.products_price, p.products_tax_class_id, pd.products_description, IF(s.status = 1, s.specials_new_products_price, NULL) as specials_new_products_price, IF(s.status = 1, s.specials_new_products_price, p.products_price) as final_price, p.products_sort_order, p.product_is_call, p.product_is_always_free_shipping, p.products_qty_box_status
      from " . TABLE_PRODUCTS . " p left join " . TABLE_SPECIALS . " s on p.products_id = s.products_id, " .
      TABLE_PRODUCTS_DESCRIPTION . " pd, " .
      TABLE_MERITKO . " m
      where p.products_status = 1
        and pd.products_id = p.products_id
        and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
        and p.meritko_id = m.meritko_id
        and m.meritko_id = '" . (int)$_GET['meritko_id'] . "'" .
        $alpha_sort;
    }
  } else {
// show the products in a given category
    if (isset($_GET['filter_id']) && zen_not_null($_GET['filter_id'])) {
// We are asked to show only specific category
      $listing_sql = "select " . $select_column_list . " p.products_id, p.products_type, p.master_categories_id, p.manufacturers_id, p.products_price, p.products_tax_class_id, pd.products_description, IF(s.status = 1, s.specials_new_products_price, NULL) as specials_new_products_price, IF(s.status = 1, s.specials_new_products_price, p.products_price) as final_price, p.products_sort_order, p.product_is_call, p.product_is_always_free_shipping, p.products_qty_box_status
      from " . TABLE_PRODUCTS . " p left join " . TABLE_SPECIALS . " s on p.products_id = s.products_id, " .
      TABLE_PRODUCTS_DESCRIPTION . " pd, " .
      TABLE_MANUFACTURERS . " m, " .
      TABLE_PRODUCTS_TO_CATEGORIES . " p2c
      where p.products_status = 1
        and p.manufacturers_id = m.manufacturers_id
        and m.manufacturers_id = '" . (int)$_GET['filter_id'] . "'
        and p.products_id = p2c.products_id
        and pd.products_id = p2c.products_id
        and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
        and p2c.categories_id = '" . (int)$current_category_id . "'" .
        $alpha_sort;
    } else {
// We show them all
      $listing_sql = "select " . $select_column_list . " p.products_id, p.products_type, p.master_categories_id, p.manufacturers_id, p.products_price, p.products_tax_class_id, pd.products_description, IF(s.status = 1, s.specials_new_products_price, NULL) as specials_new_products_price, IF(s.status =1, s.specials_new_products_price, p.products_price) as final_price, p.products_sort_order, p.product_is_call, p.product_is_always_free_shipping, p.products_qty_box_status
       from " . TABLE_PRODUCTS_DESCRIPTION . " pd, " .
       TABLE_PRODUCTS . " p left join " . TABLE_MANUFACTURERS . " m on p.manufacturers_id = m.manufacturers_id, " .
       TABLE_PRODUCTS_TO_CATEGORIES . " p2c left join " . TABLE_SPECIALS . " s on p2c.products_id = s.products_id
       where p.products_status = 1
         and p.products_id = p2c.products_id
         and pd.products_id = p2c.products_id
         and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
         and p2c.categories_id = '" . (int)$current_category_id . "'" .
         $alpha_sort;
    }
  }

but showing only 1 product.

So otherwise. Knows somebody succession files from selection manufacture in box to display his products listing?