Dorf tap replacement parts?

I have two Dorf jupiter flickmaster basinmixer vanity basin sets in my home. My home is only 10 yrs old and none of the plumbing companies can supply replacement parts for these taps which have developed a slow drip. I also have two shower sets with identical taps. Are there any companies in Australia that may have old stock for these taps? The alternative is to replace all these taps. Replacing the vanity basin sets is easy but not so the showers as the modern shower sets would require extensive and costly alterations to allow the shower combinations to be altered.