Rear Suspension Coil Springs problems of the 2004 BMW 325

I would like to bring to attention of NHTSA that my car's rear coil springs cracked due to rust. I came to know about it when I took the car for oil change at bridgewater NJ BMW dealership. I got the part replaced by a certified independent mechanic as the dealer's quote was way high. I have the removed part if NHTSA want?s for analysis. I have done some online search on this issue and found it to be a common problem due to kind of paint and coating being used for the springs. I believe this is a quality of workmanship issue and should be addressed by a recall and request NHTSA to urge BMW na to look into this matter and take necessary steps to improve the quality of the component in question as it is a huge safety issue as well.