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Not sure about a roof rack, but I believe there was a boot rack and again, not sure, but believe it a Euro option, could include the Aussie's? So I'd peruse ebay.uk and the like.
got mine from local auction portal for close to nothing, generic stuff 140cm length with type of fixing for rain gutter should work, plenty of gutter roof racks on ebay just choose right length and height for you, mine has same mount as one from amazon you linked