That is a lot of spices neatly displayed. The holders come in strips that have double stick tape on them. You simply position the strips to best match your collection of spice jars. I first attached them to a piece of white plastic which I then screwed to the door but that wasn't required. It has continued to be a useful solution for years.
Below is a photo of the opposite door on which I kept the rack provided by the cabinet makers. It is a very inefficient use of space, the wrong proportions for most spice containers and covers a fraction of the useable storage space.
I had a hard time locating my preferred type online. They are by Kitchen Art and I purchased mine at Linen and Things. I did find these two sets at Amazon. The first ones look like my originals but the available photo is quite small. The second set looks like a new type which, because of the design might be even more efficient.
Time to fix that left door in my kitchen.
©2011 Ashbee Design, Marji Roy