Is there a mounting block available for the Clipsal Saturn range?



Yes, but not specifically designed for Saturn.
The Clipsal 449B is 34mm deep and suits the Slimline plates but also fits the Saturn range. It looks a little odd because it has rounded corners and the Saturn is very square but is the closest option available. There is also a slimmer version, the 449BSD which is 16mm deep, but once again has rounded corners.
These mounting blocks have a recess at the mounting screws to allow for the protrusion behind the Slimline and Saturn plates for the mounting screws.