Replacement Headrest Mustang Covertible Headrest Replacement?

Mustang Covertible Headrest Replacement? - replacement headrest

Hello, I have a Ford Mustang convertible and I am trying to replace the headrest with 2 new ones. My problem is that the former has chosen a single tooth or a piece of metal center situated, while the new 2 teeth on each side (Universal) is common in most vehicles. Is there a way to change the leather seat of drilling or cutting-to-host-2-system component? Maby somthing or even EAIS then.