Hi, this is my first post on here and I'm a bit of a newbie when it comes to car parts. I have a 1986 325 es and there's a broken part underneath the car. It looks like cast steel and runs across the width of the car, connecting just in front of the rear tires on both sides. This part has snapped near one of the connections and I'm looking for a replacement part but I don't know what it's called (I've had it welded but it snapped just next to the weld after a few months). Any help would be very much appreciated!