Today I found a glass sunroof in a junkyard in a 528e. After some quick research I learned that apparently Saab sunroofs work in e28s? How do I know if this one is a Saab or a genuine BMW?

https://ibb.co/fCTLTd5
https://ibb.co/pjffJpC
https://ibb.co/LNKsDzg