Getting the post id for RSS thumbnail

Hey,

I am trying to get the posts id within the rss feed so i can display the posts thumbnail as i am using press75.com “Simple Post Thumbnails” plugin and how you would get the thumbnail normally from within a post would be like:

get_thumbnail($post->ID);

I have inserted the following code into my functions.php file to display an image within the rss:

function feedFilter($query) {
	if ($query->is_feed) {
		add_filter('the_content', 'feedContentFilter');
		}
	return $query;
}
add_filter('pre_get_posts','feedFilter');

function feedContentFilter($content) {
	$thumbId = get_post_thumbnail_id();

	if($thumbId) {
		$img = wp_get_attachment_image_src($thumbId);
		$image = '<img align="left" src="'. $img[0] .'" alt="" width="'. $img[1] .'" height="'. $img[2] .'" />';
		echo $image;
	}

	return $content;
}

This will place a thumbnail next to the text within the rss feed.

So to display my thumbnail from my currant plugin i would have to retrieve the posts id as this line of code does:

$img = wp_get_attachment_image_src($thumbId);

but i am using the custom plugin so i would need to use something like:

$img = get_thumbnail($post->ID);

the only thing is $post->ID wont work outside the loop so my question is does anyone know how i can achieve this type of operation outside the loop?