The parts arrived, this is how the left turn signal looks now
Compared to before:
Also got a new engine oil dipstick, and as I suspected the new one is a bit longer:
Also, finally got around replacing the fuel filter, it was easier than I thought, this is the right part in case you’re interested https://amzn.to/2tIuuvt
The 17 mm banjo bolt came out with some effort, but for the 19 mm I had to use penetrating oil and let it sit for a few minutes, then still had to fight it a little bit. The clamp is held in place by a T25 screw and the plastic cover by two 10 mm nuts.