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It's nothing like OEM Denali where a simple adapter plate would mount mini h1s to it. The reflector screws into the plastic hl housing then you have to bake the hl remove the lense to remove the hid lense from the housing.
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I sold my '88 GMC Sierra a year ago. I had the kit to keep low beams on when the high beams were on.
I loved it!!
Maybe there is a wiring/relay kit for our 2005's ?
I did put the Silverstar's in the high/low a few weeks ago, and it is better.
But all 4 lit up would be much better.