I'd look in the classified ad section of the BMWCCA magazine Roundel and on whatever BMW forums you can find.
I have a set of wheels that might fit your car. They are Borbet (Type C, I think) in a 7x15 size for an E30. I don't remember the offset. Here's a picture of one I cleaned up. The others would look the same, with a wash. I don't think any of them have any curb rash. It's been a while since I looked at them.
JR
