hey sam,
since I'm home on a Saturday night..borring...thought id have a search around.
i found it a little difficult to find any info at all,
but i did find this
catalog for spark plug leads from that company, sais its Australian too!
the car that i *think* is the 20V one is the "ae101", which has part number of TG4494, which are 5mm leads with 148mm tube length.
as can be seen in that cataloge there are alot of other cars that use this same part number, the one that stands out the most to me is the 4afe. should be the easiest to find at the wreckers/brand new i reckon?