Dominator are a Polish company.

http://dominator-wydechy.pl/en

I have heard mutterings that the quality can be a bit hit and miss? Also that returns and communication (Polish only) can be a little challenging. Might be OK bought from a UK supplier? There is an ebay shop also:

http://stores.ebay.co.uk/internationaltradepl2013?_trksid=p2047675.l2563

Just be careful that the one in your link is not for the 5-valve XTZ660, as there is no reference to model year and it does say "XTZ660" in the blurb. Best check out the catalogue on the website.

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