I have quit a few links over here of Turbo's, makers, brands that would work on a Z. I've found once you go after the manufacture and not the reseller ( i.e. Garrett not HKS ) than the price is cheaper.
The Blitz turbo like the K26 and K27 also known as KKK are used on Porsches ( I've read ) and on the fastest Z in the Pro drags ( last I read ).