Long time ago. But now the wonderful N scale 33 'metal wheels are back In Stock. The info is like Xmas for me. https://exactrail.com/collections/n-scale-parts
I have a pack on the way, as I don't think I've tried them before. If they work out, I intend to put a serious dent in my metal wheel conversion project.
I have already converted a number of cars with it. All run perfectly on ATLAS and ME Code55. I ordered two bulk packs as a precaution.