That's not a high usage item, so you might not get an answer here. Why don't you just go to the parts department at your local Jeep dealership and ask then for a bulb. You'll get to look at the diagram and see whether its the whole assembly or not.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.