Q:  What do P7 K3 7.65mm (.32 ACP) style magazines look like?

A:  P7 K3 7.65mm (.32 ACP) magazines are designed to only be used in the P7 K3 pistol.  They hold 8 rounds of ammo.  Here are the  magazines:

Q:  Are there aftermarket P7 K3 magazines available?

A:  No, not to my knowledge.