I contacted Bibby Scientific, who owns the company that made the heaters (Electrothermal). They put me in touch with folks at Cole-Parmer. They provide support for the product here in US. There are dozens of these things available in military supply system but no complete cables--so i am going to modify one.
The RAK-15 info shows unit plug is Amphenol MS3102R-16-10P (pin A is 24VDC, pin B is 0 volts and C is not connected) and two socket part numbers. One is a straight socket (MS3106R-16-10S) as listed by jpg the other is a 90 (MS3108R-16-10S). I ordered the 90 for $50. Also, the lit says to use cable clamp bushing MS3057-8A on sockets. I will post an update and picture.