This weekend I was out riding (110 miles) and after loading my 2012 550i LTD on the trailer, I noticed it wasn't sitting level. I started looking and found that part of the front left shock was broken. On the shock, there is that piece that turns to adjust the stiffness of the spring and that is what broke. So at the moment, the bottom of the spring is resting on the upper a-arm/hub assembly. Is this a common issue, or just a fluke? That shouldn't ever break, should it? Should I replace with an oem shock or go aftermarket?