Duravit Flush/Fill Valve Replacement Parts

Is anyone aware of manufacturers other than Duravit for replacement parts (fill/flush valves) for Duravit toilets. Specifically, I'm trying to repair a Duravit Series 1930 toilet.

1930 Series Toilets

1930 Series Two-piece toilet (without cistern), 1,6 gpf (6 liters), 305 mm/12" rough-in, bolt caps included, IAPMO listed, Mounting instruction included, US version, vertical outlet, washdown model

http://www.duravit.com/products/ser...-toilet--015101_toilets_90251_useo6ptm9y.html

You can always order parts from Duravit.

I can't find any tech information that shows a parts breakdown.