It sounds to me like someone put the wrong part in a box, and you were the lucky recipient.
I got a fuel regulator once, the box had the correct number on it, the part even had the correct number on it, but it was the wrong part! I had to send pictures of the part, they did send me the correct part, but it did cost me about a week worth of messing around. That part was boxed wrong at the factory.

Stuff happens. Gene