Product review (1 stars): Very Weak Magnet
Edit: Having done some additional testing with the original magnet, as well as another magnet from a different source, I can confirm that the magnet in the replacement plungers has been weakened to the point where it is useless. The original magnet is far stronger than what they are shipping today.

Not happy with this at all. Although it fits, the magnet is extremely weak and it does not hold the door at all. Haven't decided if that is a manufacturing problem, or an intentional design change to make it less likely that the plastic retaining fingers will break.