'68 Barracuda Rear Window

I've got the fastback....I bought a package of retainer clips with a count of 24 clips but 26 screws....Did they short me a couple of clips or give me extra screws....Would like to know before I put the window back in.
I had no idea they came with defoggers. I do notice a cutout near the rear window interior trim panel where a blower might fit into. Is that what you're referring to? Any idea where I may find one? Do they make after market replacement defoggers; if so where might I find one?