Ran across a post on Jabiru Australia's Facebook page stating that they are going to have Gen 1-3 heads again. I called the factory in Bundaberg to confirm. They wouldn't give me a price. I informed them that I had just spoken to Arion Aircraft and they told me heads weren't available. The Australian CSR rep said that in about two weeks time they should begin shipping these.
That's a great option for those of us with older Jabs.
Link to their Facebook Post
https://www.facebook.com/JabiruAircraft/posts/pfbid02Zb82MynfyT5Qz5bA2QMrhPtZAC3SqtenmC3aGJTFnRhY2HTxuJYLDiZ1hR751A8ul