Koos,
Unfortunately, the ram on the X5 is about an inch longer than the ST1000+ so I had to drill another hole in the cockpit locker to install the receptacle for the Autohelm. It is the same as the ST1000+. I strengthened it underneath with glass mat and epoxy. I have both the X5 and ST1000+ electrical connectors mounted by the engine control panel, and the receptacles on the cockpit locker so I can use the ST1000+ as a backup if needed. I keep both on the boat when cruising.
The pin I have on the rudder is fastened via a bent steel plate that allows the Autohelm to attach below the tiller curved section. This keeps the Autohelm horizontal and works for both the X5 and ST1000+ since they both have the same end fitting that slips over the pin.