clockm

Figured it out.

$args = array(
'post_type'		=> 'udp_sidebar',
'posts_per_page'	=> 1,
'meta_query'		=> array(
	array(
		'key' => 'upd_sidebar_appearance',
		'value' => '"' . get_the_ID() . '"',
		'compare' => 'LIKE'
		)
	)
);