True, even when you buy parts from the local autopart store instead of online you still find manufactures that don't care about quality or customers, check out this voltage regulator that did not fit at all.
And here is the Motorcraft regulator
Not only was the mounting plate not cut correctly so it would not fit and clear the rotor, but hole for the pin to hold the brushes in was drilled in the wrong spot. This is something you can buy from the autoparts store and the manufacturer does not give a **** and they won't correct it, or at least at that time.
BTW, my dumb@$$ did not want to wait, so I filed it to fit and drilled the hole in the correct spot. It was a complete waste of time, because it stopped working after one or two minutes later.