This is a pair of harness adapters so you can utilize H4 headlamps with your Stock H13 wiring harness. Many vehicles such as new Jeeps use H13 lights. H4 and H14 have the same base flange, but different sockets. This allows you to use H4 HID and LEDs in your vehicle without cutting your factory harness.
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I bought a pair of these adaptors to install new 7" round LED Headlamps. The adaptors fit nice and snug to both the new LED Head Lamp and to the original Jeep Harness. I still wrapped the connections with electrical tape just to be safe from the excess vibration or if water happened to get to them.