Not something I anticipated having trouble finding. Been to Trak, Chief's and Pep Boys so far. They are listed in the catalogs hanging in the aisle, but no one actually stocks them. The Sylvania 9008, for example. Wassup with that?
I know this was a redesign, but they couldn't use an existing bulb type? I use the 9005 in my truck. It's a very nice bulb. Team Mustang couldn't just design that one in?
I'm an engineer myself (satcom), and even on the bleeding edge stuff, for basic things (panel displays, LED lights, buttons) we look for what's readily available.
I have this vision of a Ford guy looking at a diagram and saying, "Hmmm... the base of the bulb has tabs at 55 degrees and 95 degrees. We really need the tabs at 60 degrees and 91.2 degrees. That's important."