On mine it was like an adapter. I screwed it onto the bulb then inserted the bulb into the headlight housing.
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The answer to everyone's question......
On 2005-2007 headlights, yes, you can rotate the retaining ring to give you outside/outside or inside/inside LEDs as apposed to Left/Left.
I chose to put the lows on the outside because when I walked around the truck, these were the reflectors that...
This can't be universally solved. In 05 headlights they are left and right not top and bottom. But 05 reflectors are also lateral reflectors, not up and down reflection.
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Mark I got my lights today thanks. They look sweet. I did have a couple of problems though. On the connectors from the driver to the truck, there are 3 little alignment tabs. It seems the mold for the connectors was off a bit and I had to break one tab on each to get them to fit. They also...
I've never seen it, but color means nothing in the coolant world these days. Do you have the bottle? Check for "CAT EC-1" in the rating section. That is the coolant rating you wnat for an HD ELC.