Add Exchange Product Featured Image to Builder Extension

<?php if ( have_posts() ) : ?>
    <div class="loop">
        <div class="loop-content">

<?php $paged = (get_query_var('paged')) ? get_query_var('paged') : 1; query_posts("it_exchange_category=rug-display-combo&post_type=it_exchange_prod&paged=$paged"); ?>

        <div class="portfolio-extension-wrapper clearfix">
            <?php while ( have_posts() ) : // the loop ?>

<?php it_exchange_set_product( $post->ID ); ?>

                <?php the_post(); ?>

                <div <?php post_class('portfolio-post-wrap'); ?>>
                    <div class='portfolio-post entry-content'>
                        <?php if ( has_post_thumbnail() ) : ?>
                            <a class="entry-image" href="<?php the_permalink(); ?>">

                                <!-- <?php the_post_thumbnail( 'it-portfolio-thumb' ); ?> -->

<?php it_exchange( 'product', 'featured-image', array( 'size' => 'thumbnail' ) ); ?>

                            </a>
                        <?php else : ?>
                        <?php endif; ?>

                        <span class="portfolio-title"><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></span>
                    </div>
                </div>
            <?php endwhile; // end of one post ?>
        </div><!-- End of Portfolio Extension Wrapper -->
    </div>