Video tutorial on how to replace the BMW plastic retaining bolt on the trunk lid toolbox. This tutorial apples to various BMWs equipped with the trunk lid tool box. The part number for this particular car is 71 11 1 179 444. Be sure the verify if that is the correct part number for your vehicle by visiting RealOEM.com. The main reasons why this plastic bolt breaks is either slamming or closing the trunk too hard, over tightening, and the plastic becoming brittle with age and finally breaking on its own. This particular tutorial was done on a 1997 BMW 540i.