Looks to me that you need to buy the headlamp (13007-4C). The bulbs shown (U-LH4A and B) look like replacements. I'd presume the headlamp comes with the lower power A bulb installed.
NPD does a good job of answering their phones and if they don't know, the guy will walk out to the parts shelves and open a box up to see what is in it so you should know what the deal is in one call..
These sure look very interesting as they look compatible with the standard Bronco 3 blade headlamp connector, and fit the EB headlamp install setup..
Thanks for giving me enough reason to check it out, because NPD's got a new PDF catalog and search tool with section headings to make thumbing thru easier.