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.