Add thumbnail to the list item post

Hi,

I want to display the post thumbnail on the order page, I can see in the plugin files where the list is bein created but how can I hook into the “for” loop:

// On liste les posts du tableau $posts_array pour le trie
for ($i = 0; $i < count($order_result); ++$i) {
$post_id = $order_result[$i]->post_id;
$post = $temp_order[$post_id];
unset($temp_order[$post_id]);
$od = $order_result_incl[$post->ID];

echo ‘<li id=”‘.$post->ID.'”>’;
echo ‘<span class=”title”>‘.$post->post_title.’</span>’;
echo ‘‘;
}

thank you!