i brought my eninge of a gauy out liverpool sort of way and the place actually looked like a manufactoring plant for extractors and manifolds. it shouldnt be to hard to find a place with extractors. look in yellow pages under motor performance or something like that.
http://www.surefloexhaust.com.au , look in the exhaust section, they stock genie extractors give em a ring, atleast they ma be able to order them in for you