I'm sure they worked with an OEM (they pretty much had to, to work within their manufacturing processes), but your implication that they grabbed a part off the

I'm sure they worked with an OEM (they pretty much had to, to work within their manufacturing processes), but your implication that they grabbed a part off the shelf is just not accurate. Keep in mind that doing an original design is not a terribly high bar, but yes beats were a custom designed part. They worked with an OEM the same way Apple worked with an OEM. That doesn't mean it is good, just custom.