Just seeing this thread for the first time, noted some posts earlier regarding Lightburn Zeta sales brochures. In a previous life as a motoring book dealer I sold many thousands of Australian vehicle brochures, amongst them at least a hundred or so new, unused standard Lightburn Zeta items, from memory about 8 pages. Rare, they were not, at least in the 1990s. I obtained a stack of them from an old Adelaide garage that was being closed (cannot remember the details now), and several other dealers also had lots of them.
The brochures were a consistent good seller at $10 each for a few years, mainly for novelty value. There will be plenty of Australian brochure collections that have a copy.