We installed an Arke toilet bought from Bathstore.com in 2005. The flush system is now malfunctioning and we need to get replacement parts. Bathstore say they were manufactured by Wirquin, but their website doesn't now supply anything like what we need. There are two elements to the flush system: a tall, bright blue plastic piece and a white part which is the float. Neither are working correctly. Also the silver push button is broken.
I believe that this is a newer version of the cistergn fitting you have (I've got the same) and will fit the Galassia Arke. I'm not sure if this includes the float part also, probably best to check with the seller first,
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Try fixfault.com to fix plumbing.