I supplied the Viggen inserts for those early ones. They are unfortunately gone many years ago. I think I have one damaged one for my collection.
This is why I made the new 3d domed ones. They are a lot nicer in the hand. I have blanks but they are not heavy. Pretty thin disks to replace the factory top, so they have to be similar size. Also if there was too much mass to it on a cold /hot day it would be a problem