Purchasing a 1947-1955 optional cigarette lighter assembly from many vendors provides you a reproduction that is far from correct. It appears an overseas manufacturer decided to offer a lighter assembly made with the currently available 12 volt base and joining it to a 1947-1953 headlight knob.
Thus, no tooling investment and all parts were already available. Check the following images. What a difference!
Original Note: The correct lighter base and knob can now be obtained from Jim Carter Truck Parts (above)
Incorrect Replacement Knob (above)