I purchased these for my 2004 Audi TT Quattro 225hp Turbo.It is an exact replacement for the OEM part. To install it, get someone to hold the trunk lid up, use a small screwdriver to pry up the metal clip on the old strut, then you can pop off the old strut from the ball. Do this to both ends of the strut. (instructions are on the package)Installing is the same - small screw driver to lift up the clip, then press onto the ball. Whole thing took about 15 minutes.My Audi dealer quoted $170.80 for 2 struts and $78.20 for installation. Total $249 plus tax. AutoPartsWAY cost $82.96 which included no tax and free shipping.