e34 Touring rack question

[motuman]

I'm thinking of picking up an e34 touring and I have a question about the factory rack.

Are there factory "crossbars" available and would they be strong enough to hold a surfboard ay highway speeds?

Can you fit any aftermarket racks with the factory rack rails in place?

I attached a photo from the car I am looking at. There are no crossbars and it doesn't look like there would be room to mount an aftermarket rack... (Yes this has the panoramic roof, or whatever it's called. Does that make a difference?)

Thanks!