I had a bit of time to accomplish something on the truck yesterday. I got the passenger AC duct figured out. I ended up having to customize the clip for the top screw. I basically had to have it so that it was right tight to the edge of the cutout which still didn't give me enough clearance for the top clip on the adapter but at least the adapter fits in the opening now. So after trying a few things, none of which ended up working out, I cut the top tab on the vent. This gave me what I needed to get the adapter in place. I even got way lucky and the modified clip actually grabs the top tab on the adapter!
I also added to the edge of the vent under the corner of the glovebox as it was formed wrong in that area and I was not liking the fit. Fits like a glove now though!