This unit is specific to the Transit Custom
It replaces both the factory OEM Unit as well as the bulb inside, you simply plug this unit into where the bulb previously went and slot the unit back into position.
The results are superior to any led bulb on the market today.
The unit itself is soldered and silicone sealed to stop water ingress (Factory units from ford allow water into the holder, causing a normal led bulb to disintegrate after time)
This unit has 18 LED's built into it, Making them upto 12x Brighter than any standard LED on the market today.
13 months guarantee on these Units!