the D16a6 is a 1.6 version of the D15b7 and the D16y8 is a SOHC VTEC engine - both very different to the ZC

have you tried exedy america? they have alot of stuff listed that australia dont
have a look on d-series.org as well - those guys are very knowledgable on this stuff

the ZC is closely related to the D16a8 and D16a9 - but not the same