There are plenty of cable sellers who sell DIN cables wired for Naim gear, or who could make up such a cable if shown the pin connections as found on the diagrams next to the sockets.
Can I ask what input you were using on your PreAmp please using this adapter?
I only ask as I’m a little confused with their description:
**** looking at 5 pin din plug pins, from left to right or clockwise pins 1.2.3.4.5.***
**** Pin 1 Hot to Left hot on rca socket***
**** Pin 2 Hot to Right hot on rca socket***
**** Pin 3 common earth cold left and right on rca cans***
**** Pin 4 not connected***
**** Pin 5 not connected***
The “left to right or clockwise” statement is contradictory ?!?
Edit: not contradictory if you look at the pins and they’re all at the top