Pickups info – where to find ?

Hi guys I am new here… tried to find the info by the search-bar but no success. (sorry)
About the Pickups magnets along the Years at Stingray’S Special and the Classics too (Four & Five Strings).
Ceramic / Alnico / Neodymium.

I see this is a very commented issue, and I dont want to creat a new thread in duplicity for sure.
so if you could point where can I get this, I would appreciate so much.

Thanks all!