I have a 2003 325i. Unfortunately, I have noticed that the rear bumper is fragile and very susceptible to dings at the bottom edge. Recently, I noticed a 330 in my area with a slick looking black edge which looked like a protector. Does anyone know if this is OEM, and if not, where to get one for the 325i? If not, are there any suggestions for rear bumper guards for the 2003 325i? Thanks!