Rear liftgate lift support shocks are gas cylinders which apply an accurate amount of pressure on the lid's bottom. As soon as you release the trunk or from inside of the vehicle and it raises about halfway, this is when shock come into play. Makes your opening or closing easy and comfortable, convenient and safe. On the basis of equipment design, direct replacement for the old and broken one. 1. Start with the gate fully open and supported. It helps to have a second person hold the liftgate (or hood/trunk lid) open while the support is out. If you 't have a second person, you can use a broom handle or something like that. 2. Use a flat-blade screwdriver to release the flat bale clip that holds the support onto the post. Top or bottom post, does not matter. 3. , place the new support into position and snap the post into the mount on the support, again, top or bottom first does not matter. 4.the new strut onto the ball stud and release the clip. When you release the liftgate, do so slowly, checking to make the supports are fully installed and supporting the weight. Name: Power Hatch Lift Support Placement on Vehicle:Rear Left Part Number: 51247332697 Interchange Part Number:51 24 7332697 Colour: black Material: metal Fitment: For X6 E71 E72 2008 2009 2010 201 2012 2013 2014 Package Contents: 1 x Electric Lift Support Gas Strut Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.