Customn Page Template – choose widget for sidebar

Hi
I’am using the code underneath for a custom page that works fine however I would like to change the widget in the right column (recent posting) into a existing widget. Can you tell me how to do this?

<?php
	if ( !defined('ABSPATH') ){ die(); }
	
	global $avia_config;

	/*
	 * get_header is a basic wordpress function, used to retrieve the header.php file in your theme directory.
	 */
	 get_header();

	$title  = __('Blog - Latest News', 'avia_framework'); //default blog title
	$t_link = home_url('/');
	$t_sub = "";

	if(avia_get_option('frontpage') && $new = avia_get_option('blogpage'))
	{
		$title 	= 'Staff'; //if the blog is attached to a page use this title
		$t_link = get_permalink($new);
		$t_sub =  avia_post_meta($new, 'subtitle');
	}

	if( get_post_meta(get_the_ID(), 'header', true) != 'no') echo avia_title(array('heading'=>'strong', 'title' => $title, 'link' => $t_link, 'subtitle' => $t_sub));
	
	do_action( 'ava_after_main_title' );

?>

		<div class='container_wrap container_wrap_first main_color <?php avia_layout_class( 'main' ); ?>'>

			<div class='container template-blog template-single-blog '>

				<main class='content units <?php avia_layout_class( 'content' ); ?> <?php echo avia_blog_class_string(); ?>' <?php avia_markup_helper(array('context' => 'content','post_type'=>'post'));?>>
                    
                    <?php
/**
* Single Staff Member
*
*/
 
 
// First we get fields from our staff member custom post type into variables
 
global $post;
$custom     = get_post_custom();
$t_name         = get_the_title();
$name_slug  = basename(get_permalink());
$title      = $custom["_staff_member_title"][0];
$email      = $custom["_staff_member_email"][0];
$phone      = $custom["_staff_member_phone"][0];
$fax        = $custom["_staff_member_fax"][0];

                    
$bio = $custom["_staff_member_bio"][0];
                  
                    
                    
                    
$prof       = $custom["_staff_member_prof"][0];
$fb_url     = $custom["_staff_member_fb"][0];

if(has_post_thumbnail()){
 
$t_photo_url = wp_get_attachment_url( get_post_thumbnail_id() );
$t_photo = '<img class="staff-member-page-photo" src="'.$t_photo_url.'" alt = "'.$title.'">';
}else{
$t_photo_url = '';
$t_photo = '';
}
$email_mailto = '<a class="staff-member-email" href="mailto:'.antispambot( $email ).'" title="Email '.$name.'">'.antispambot( $email ).'</a>';
?>   
<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<header class="entry-header">
 
 
<?php /* The loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>
<div class="staff-member-wal">
<h2><?php the_title(); ?></h2> <!-- This is the Standard page title -->
 
<h3><?=$title?></h3> <!-- This is the Staff Memeber Title -->
 
<?=$t_photo?> <!-- This is the Staff Memeber Photo -->
 
    
<?php    
if ($bio){ echo '<div>' . wpautop( $bio ) . '</div>'; }      
?> 
    
<?php the_content();?>
 
<?php endwhile; ?>    
    </div>

               

                   
				<!--end content-->
				</main>

				<?php
				$avia_config['currently_viewing'] = "blog";
				//get the sidebar
				get_sidebar();

				?>

			</div><!--end container-->

		</div><!-- close default .container_wrap element -->

<?php get_footer(); ?>