Q:  What do P7 K3 9mm kurz (.380 ACP) style magazines look like?

A:  P7 K3 9m kurz (.380 ACP) magazines are designed to only be used in the P7 K3 pistol.  They hold 7 rounds of ammo.  Here are the  magazines:

p7k3_9k_L.jpg (366397 bytes) p7k3_9k_R.jpg (375141 bytes) p7k3_9k_3.jpg (239790 bytes)

Q:  Are there aftermarket P7 K3 magazines available?

No, not to my knowledge.