Hello John. Thanks for the links. I looked them up. But the listing is odd. I had what I thought were grey wire magnets, bit the pic looks like they were white. The replacements came in with white wires and were larger. I just remembered that I posted years ago about the difference in the magnets and I had pics. I ordered them by the axle weight. And this is what I got.

As you can see there is a substantial size difference. I had to make sure they fit inside the drum, which they did. I just crawled under and checked. My axles are 5200lb by Lippert. So not sure what to think now. All I know is it stops very well! When I go through the bearings and brakes I'll get some pics.
Thanks again.