Product review (5 stars): Beware the REVERSE threads, and expect a bit of work to remove the old part.
OEM part for the right fit, with plenty of nice installation videos online to show you how to do the job right.  Remember, it's REVERSE threaded!  Also beware, this particular part tends to get seized to the shaft over time so you may have to destroy it (literally) to remove the old one.  The new one went on like a breeze and works great though.