I have two sets of four. I priced them on eBay and was amazed what a broken old center cap sells for. These are worn and have many defects. Click on the pictures for higher resolution images, that is better than me describing them.
Each set of 4, as is, as pictured, $40 shipped USA.
Set 1:
993.361.303.09
*some significant chips in the crests
Set 2:
993.361.303.10
*Silver paint has worn off of 3 of them.
All 8 in different lighting, better contrast:
I am willing to sell individual caps $15 shipped.