Some rattle is a start to a top end miss as finch said. You may be fine for now, but as the magnets break up you'll start to notice it.
Now with that being said, oem is the only way to go.
Why I know that is because I bought a aftermarket knockoff and the rivots all loosend up on me within a few months to make it worthless .
So search on here or shovel over the coin do a new oem