Use webmaster mode and look at the variables assigned on those pages. Here is a tut if you are not familiar with this method:
http://forum.x-cart.com/showthread.php?p=335522 #2 on the list currently.
If you can see the variables, you should be good to go to write some Smarty code, if they are not assigned you will need to dive into the DB with PHP and assign them.
Kind of a generic response, but hopefully it will help.