В template.php добавляем:

// Ubercart 3 Cart block
function НАЗВАНИЕ_ВАШЕЙ_ТЕМЫ_uc_cart_block_content() {
    global $user;  
    if (variable_get('uc_cart_show_help_text', FALSE)) {
        $output = '<span class="cart-help-text">'
        . variable_get('uc_cart_help_text', t('Click title to display cart contents.'))
        .'</span>';
    } 
 
    $output .= '<div id="block-cart-contents">';
    $items = uc_cart_get_contents();
    $item_count = 0;
    if (!empty($items)) {
        $output .= '<table class="cart-block-table">'
        .'<tbody class="cart-block-tbody">';
        foreach ($items as $item) {
            $output .= '<tr class="cart-block-item"><td class="cart-block-item-qty">'. $item->qty .'x</td>'
            . '<td class="cart-block-item-title">'. l($item->title, 'node/'. $item->nid) .'</td>'
            . '<td class="cart-block-item-price">'. uc_currency_format($item->price) .'</td></tr>';
            if (is_array($item->data['attributes']) && !empty($item->data['attributes'])) {
                $display_item = module_invoke($item->module, 'cart_display', $item);
                $output .= '<tr><td colspan="3">'. $display_item['options']['#value'] .'</td></tr>';
            }
            $total += ($item->price) * $item->qty;
            $item_count += $item->qty;
        }
 
        $output .= '</tbody></table>';
    }
    else {
        $output .= '<p>'. t('There are no products in your shopping cart.') .'</p>';
    }
 
    $output .= '</div>';
 
    $item_text = format_plural($item_count, '1 Товар', '@count Товара');
    $view = '('. l(t('View cart'), 'cart', array('rel' => 'nofollow')) .')';
    if (variable_get('uc_checkout_enabled', TRUE)) {
        $checkout = ' ('. l(t('Checkout'), 'cart/checkout', array('rel' => 'nofollow')) .')';
    }
    $output .= '<table class="cart-block-summary-table"><tbody class="cart-block-summary-tbody">'
    .'<tr class="cart-block-summary-tr"><td class="cart-block-summary-items">'
    . $item_text .'</td><td class="cart-block-summary-total">'
    .'<strong>'. t('Total:') .'</strong> '. uc_currency_format($total) .'</td></tr>';
    if ($item_count > 0) {
        $output .= '<tr><td colspan="2" class="cart-block-summary-checkout">'. $view . $checkout .'</td></tr>';
    }
    $output .= '</tbody></table>';
    /* $output .= '<a href="/some_path">Custom Link in bottom</a>'; */
    return $output;
}