So here are photos of my Astra G power steering installed on my TGB1111. Sometimes it does not works as it should. I think it is due to electricity problems as it needs 12v and now I am taking it from one of the batteries - not good for 24v system. But it works fine the most of the time. I needed it for taking part in competitions where I need to steer fast, otherwise struggling with factory steering was fun and substituted workout in Gym

https://goo.gl/photos/KDQxJprXbcLAMP8m6
https://goo.gl/photos/cbUHwyKYJRh8u7nJA