I have 535is rear spoiler for sale. By mistake I bought it for my e30 325 and it's a bit too wide.
It mounts with double-sided tape, color-carbon black metallic. Mint condition!
Price $100 (firm) + shipping. I am in NJ.
The pic below shows the spoiler (on e30 325). This spoile is the same only for 533, 528 or 535