I had to replace a headlight bulb in my '14 Laramie Longhorn last summer. It is a pain to get to. In addition to removing the grill to get to two bolts on the front of the headlight housing, you have to go through a flap in the front wheel well liners to get to a bolt in the back. Once you get those three bolts out, you pull out the entire headlight housing to get to the bulb from the back side. I took the burned out bulb to my local Advance Auto parts and bought a pair of replacements (don't remember the make/model I bought, but I have the package in the garage for future reference). I did replace both, my thinking being if one went, the other might not be far behind it and so both headlights would be the same (no difference in color/temperature/light output between the two).
On the plus side, I broke two snap fasteners holding the grill in and had to order some new ones on line. Be careful while wiggling and pulling on the grill!