This is a long shot, but does anybody know the measurements of the two bolts that hold the window track to the door frame? The two bolts in particular are the two slotted bolts with lock nuts located at the bottom of the door (they commonly loosen and cause the window to bang). One of mine is going to die if I remove it again and the other is fully stripped of thread thanks to a last technician. If I can get the thread measurements, there's a massive fastener store near me that probably carries them, or something close enough that I can cut down. I live near Seattle too, so a loose window is no bueno around here.

 

You can probably just swing by Lynnwood Infiniti or whatever dealership is closest and have the parts counter pull up the window track hardware kit and buy the whole thing, sure you'll end up with a few extra fasteners. They might sell individual fasteners too though, just have them pull the exploded view up on screen so you can point to exactly which ones you need.