For my F150 topper I had originally fabricated brackets for 500 series duo heads using 2" Al L channel and used VHB tape to secure it to the glass. I got tired of warning planes when my windows were open so I drilled holes and piggybacked into the screws for the window frames. This is the early prototype:
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I added alley lights, and the newer version uses a cut-down
TA housing. Still working on the mounts for that. Here is is in dual mode (it's a .gif, not sure if it will run):
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