Got a feeling that as the 4AGZE was never available locally, you'd have to grab this off an import wrecker. Whether they'd separate though is another matter.
If worst comes to worst, get in touch with Thundercords (believe they're a Toymods supporter). They'll supply you with Magnacore leads which are custom made provided you can tell them what you're looking for.
I got my 8mm Magnacore leads from them for my 86kw 4AGE Rwd engine and they are fantastic!