OP here. Every good story needs a good ending so here goes. I received two different dm’s from forum members to send me an original replacement driver for the kg4’s. But in the end I decided to return the speakers to the seller who gave me a refund. Thanks to you guys for offering to help me out!
That’s not all though! I also got a message from another forum member fairly close to me. They invited me over to check out a pair of Heresy II’s that they weren’t using. Well I dropped by today, had a great chat, listened to some music on a very cool sound system, and ended up buying them from the generous person. So now I’m sitting back and enjoying. I love the Heresy’s so far, so much clarity and liveliness.
Seems like things worked out for the best, all because of this forum. Thanks everyone for your suggestions!