Going to retrofit a Homelink console to my Trailblazer that currently has nothing overhead. There is a plastic support skeleton that mounts to the actual roof via 4 screws. This plastic skeleton is in between the headliner and the roof. The console actually mounts to this skeleton. In the roof there are 4 fasteners... kinda like a push nut. Anyway you cannot remove them from a junkyard vehicle without destroying them... or at least I haven't found a way. I also cannot find the part number for them as the GM description doesn't even show how the consoles mount to the roof. If anyone knows the part number on this fastener I'd sure like to have it. Below is a pic of one I pulled out of a junkyard Trailblazer. I broke it getting it out.
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