they can do one for me new at just over £200 sheets. Can you do anything better. ;-)
My new Nissan price would be the same as CMS so best just to get from them if you want to go new.
However I may have a pre-owned one in stock.
Drop me a PM if you prefer to go the pre-owned route.
It will be the concentric slave cyl.
Best to take it to a garage that know what they are talking about for the repair.
Depending on mileage may be a plan to swop out the fly and clutch and also fit an upgraded CSC.
Varta D47 Blue is the way to go:
http://www.ebay.co.uk/itm/Varta-D47-Battery-Nissan-350Z-Roadster-Z33-3-5-10-03-/272049447394?hash=item3f576921e2:g:--0AAOxy0bRTDbye
As what has already been said, however these seals should be replaced when a new screen is fitted.
Prehaps time for a trip back to the windscreen specialist