A friend of mine got a spare oil filter house (m50TUb25) and I compared it to the m52b28 one.
It shares the same basic design but as you can see, the bracket for the steering pump is significantly different. It’s narrower, doesn’t have the same hole for the lower bolt and more importantly, it has no place to connect the Vanos line to… So this one is not going to help me. As this part is very very rare as a second hand part and a new one will cost about 200 euros, I tried my own solution. Degrease the leaking gasket and force some liquid gasket seal in there. I let it dry for several hours, then reassembled all the parts back on the car and went for a drive. After 2 hours driving it’s still dry! 🙂