I'm trying to do a URL rewrite for 3 categories on the layered navigation to external URLs. I tried doing 301 redirects in the .htaccess file--that didn't work. I tried using Magento's URL rewrite management tool--that didn't work.
The link on the layered navigation is shows: http://dev.morrisononline.com/index.php/shop/petroleum-brands/76.html
I tried using this link, and it's category ID to do the rewrites and neither worked.