Yoop,
I can actually help out here. I am good friends with the originator of the original Thunderhead and have a few of his leftover blades! Send me an e-mail or message on how to get one over to you.

Make sure you add epoxy, or a waterproof glue to the slot. Use a brass screw eye in the little hole in the blade and it should stick for a long time. Awesome lures, I can't imagine why they ever stopped making them.

Rocko