It's even easier to do it digitally. In Photoshop, choose "Select all." Then go to Edit, and select "Stroke". Adjust your border size (I like to use 20 - 25 pixels), and click Apply. Go back and click on "Deselect." You're done.
The filed edges should leave the carrier with the smallest openings next to the negative top and bottom. Get yourself a Saunders 4 way masking easel. This allows you to center 5x7, 8x10, or 11x 14 paper in the easel while printing wide white borders with or without a black line.
I created my own "digital" borders that mimic film edges but really aren't. I'm not trying to represent one media as being something it's not. But it does tie into the heritage of photography and it is also a very useful compositional tool -- it keeps the whites from flowing out of the photo and it reinforces the depth of the black shadows.
I would never use those DV or Kubota frames, cheesy yuck.