WP - WooCommerce - Admin Filter Product List By Taxonomy

add_filter( 'woocommerce_product_filters', 'filter_by_custom_taxonomy_dashboard_products' );

function filter_by_custom_taxonomy_dashboard_products( $output ) {

  global $wp_query;

  $output .= wc_product_dropdown_categories( array(
   'show_option_none' => 'Filter by Model Year',
   'taxonomy' => 'pa_model_year',
   'name' => 'pa_model_year',
   'selected' => isset( $wp_query->query_vars['pa_model_year'] ) ? $wp_query->query_vars['pa_model_year'] : '',
  ) );

  return $output;
}