Any BMW Wanted Bad Aluminum Suspension components

I'm looking for cast-off, used and otherwise trashed aluminum suspension components.

I'm working on a new sculpture consisting of BMW parts (it came to me while changing the thrust arm on the 540).

I do welded aluminum sculpture and would love some donations (save the scrap!) for my next sculpture. I'd be willing to pick up in NYC area or pay for shipping if it isn't too much.

Particularly interested in control arms and organic looking shapes. Anything cast or machined aluminum would be good. Condition not necessarily important. Valve covers, timing chain covers, etc would be good too.

Thanks!