Hi,
searching for the same issue I found a complete solution here http://www.zen-cart.com/forum/showth...+header+column.
This solve the problem and do not break the CSS.

For reference:
Admin: Tools : Layout Boxes Controller:
sideboxes/search_header.php
Left/Right column status: off
Column: right
Left/Right sort order: 0
Single column sort order: 0
Single column status: on

-Harlock