Order by issue

Hi,
I’ve the following code to display set items on a home page:

<?php

	$args=array(
	'orderby' =>'ID',
	'order' =>'ASC',
	'post_type' =>'page',
	'posts_per_page' => '4',
	'post__in' => array(8,61,40,81),
	);
	$page_query = new WP_Query($args); ?>

	<?php while ($page_query->have_posts()) : $page_query->the_post(); ?>

I wish to display the order exactly as I’ve entered it, however, it keeps swapping the middle 2 around.

I use My Page Order plugin and have set them in the system as 1,2,3,4 so page 8=1,61=2,40=3,81=4 but even this doesn’t work.

Is there a way to sort this apart from doing the same code 4 time?

TIA