Welcome to the Bunnings Workshop community. Thank you so much for joining us and sharing your question about the Helicoil wood thread.
It's great that @JDE has pointed you to the right product. Here is the link to the Taskmaster Screw In Insert Nut. If you are after a particular size, please let me know and I can make some inquiries for you at the Special Orders Desk. It sounds like you are building a special project. Any updates you can provide would be much appreciated.
If you need further assistance, please let us know.