Saturn module = 4061E2PUDM-TR (not available complete in NZ)
Clipsal 30 series module = 31E2PUDM-WE complete = C2031E2PUDR-WE
PDL600 module = PDL654PBMWH complete = PDL654PBWH
PDL800 module = PDL854PBMWH complete = PDL854PBWH
Note:- Being universal dimmers they may not be suitable for LED's as most LED drivers require a trailing edge dimmer.
A push button dimmer can not be used in a 2 way circuit as it requires a physical press to turn on.