This modification to zen cart will allow you to display divider lines  in a columnar layout for the following modules/pages:

- New Products on the main page
- Special Products on the main page
- Featured Products on the main page
- Special Products on the Specials... link
- Additional images on the product page
- Customers Also Purchased on the product page
- Cross Sell on the product page (note that Cross Sell is a separate contrib that would need to be installed separately.)
- Product Listing page (a separate modification that wold need to be installed separately)

Also of importance to note:  while the grid image will remain uniform, your product image, title, description, etc will fluctuate inside the boxes depending upon text length and size of image.  It is highly recommended that all your images be of the same exact size.

Zen Cart Versions 1.3.9, 1.5.0