Just wanted to add that the GMC HD models all have LED headlights and tail lights, including the Pro model. I think the LTZ Chevy is the model that adds LED headlights. Something to think about as I read posts here about updating to LED headlights. Big price difference between Chevy Custom and LTZ.
There's no additional mounting brackets for the grille or headlights. The only difference between the grill mounting is the active grill shutter frame to which the grille attaches too. There is a slight difference between the older and newer shutter frame, but you CAN reuse your existing one. There'll just be a couple clips that won't attach to anything. The headlights fasten exactly the same. The only brackets you'll need are a couple for the bumper.
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