Suggestions for Hue Motion Mount Replacement

I have an older Hue Motion Sensor (9290012607) and I can't find the magnet post for it, and Hue won't help since it's out of warranty of 2 years. Any suggestions on places to find this post? If I can't find it, I'll just go with a wall mount that doesn't use that post.

Couldn’t you just buy a neodymium magnet to replace it, they have all kinds of those on Amazon.

Would anyone have the size of one that would work?

Looking at something like this: Neodymium Magnet with Holes, 18lbs Pulling 0.63"(16mm)