Hello,
I've just come across this very interesting post. I also fly an old G940 and I think the idea of fitting 2 shock absorbers is a very good one. I looked on the net for the same as you but I'm not sure it's the right reference (I can't find the dimensions). Do you remember what the reference was?
The only one I've found is this one, is it the right one?
Ref Manufacturer: 1230544
https://www.lindinger.at/fr/VEHICULES-BATEAUX/ACCESSOIRES-POUR-VOITURES/ABSIMA-Amortisseur-de-direction-piece-detachee/9778100
Thanks in advance.