The Ford F-150 is one of the more common vehicles in North America. Parts for it are commonly available, and are far more numerous than most other vehicles, who quite simply sell fewer copies. The light truck arm of Ford accounts for half it's sales.
Now, all is not perfect. One of the things I like least about Ford trucks is that company's traditional practice of changing mechanical parts in a very short time ... sometimes every year, sometimes a few years, but generally often. It's a result of a corporate policy going back to Henry Ford himself to constantly cut costs, and one way they do that is to revise part design pretty much on an ongoing basis.
GM trucks tend to retain part design for a much longer time. So a part might be used for five, ten and even twenty years, the savings coming from economies of scale. It's just a different approach to cost accounting, but it does affect the owner when it comes to buying parts. A V-8 GM vehicle has the cheapest parts cost in North America, almost in every case.
So perhaps you find that a power steering pump from a 2010 won't fit a 2008 or a 2012 model of the same vehicle. This does limit parts availability if you are into saving money. Ford parts tend to be comparatively expensive and comparatively scarce. Still, reread the first paragraph.
