It is stated that these are "plug and play", and even has a pic of the pigtail.
I have a similar set in my 76 Ventura, made by Lund under the brand name of Rampage. Installation was as simple as changing a regular sealed beam headlight, and they work great, much better light than the old school ones. The only thing I remember was that I couldn't use the small rubber boot as it interfered with the bucket.