The Z1 kit is poorly engineered in my opinion. I've installed many Zspeed CSC's and a few Zspeed CMAK kits. the ZSpeed kit is far better engineered. I still prefer their Tilton CSC to keep things simple, but for those looking to convert to a pivot system the Zspeed would be the way to go.
OSGiken makes a kit using some JDM and USDM Nissan parts to be used with their twin disk clutch kits but i haven't had a chance to install one of those kits so can't comment on it, I'm sure it's high quality as OSGiken has never failed to impress.
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