I drove a Corrado TDI.
'I only removed the gasoline pump and installed the 'device' from the diesel tank in its place. It was quite simple, almost plug-and-play. Why do you want to install the tank in the Golf? If you're thinking about the 70-liter tank, there might be problems. I also wanted to install that tank in my Corrado, but it only fits certain models and from a specific production year. Otherwise, you would have to 'modify' the trunk. So, it didn't fit in my Corrado. Whether it will fit in the Golf... hmm, I doubt it, but I wouldn't be surprised if it worked.'