<script>
( function( $ ) {
    $( document ).ready( function() {
        function setClass() {
            if ( $( 'body' ).hasClass( 'single-product' ) ) {
                $( '.component_option_thumbnails_container .component_option_thumbnail_container:nth-child(n)' ).removeClass( 'last' ).removeClass( 'first' );
                $( '.component_option_thumbnails_container .component_option_thumbnail_container:first-child' ).addClass( 'first' );
                $( '.component_option_thumbnails_container .component_option_thumbnail_container:nth-child(3n)' ).addClass( 'last' );

                //Review Configuration
                $( '.summary_elements .summary_element:nth-child(n)' ).removeClass( 'last' ).removeClass( 'first' );
                $( '.summary_elements .summary_element:first-child' ).addClass( 'first' );
                $( '.summary_elements .summary_element:nth-child(2n)' ).addClass( 'last' );
            }
        }
        setClass();
        $( document ).ajaxComplete( function() {
            setClass();
        } )
    } );
} )( jQuery );
</script>