StrongArm 4372 Mercury Mountaineer, Glass Lift Support, Pack of 1 Exact fit, OE quality design ensures easy installation and operation No special installation tools required Rubber O-Ring piston seal forces the fluid efficiently through the valving components providing consistent performance Patented Multi-Lobe Seal makes gas springs more tolerant to vibration and temperature extremes Individually tested for performance and reliability Turn off ignition. If old lift support has a window defogger electrical connector, carefully disconnect the fittings. Before removing old lift supports, examine any hardware provided to determine which components must be reused. Work on lift supports one at a time and do not remove both lift supports at the same time. Replace one, then remove and replace the second one. The new lift support must be installed in the same position as the old one which was removed, unless otherwise instructed. Do not nick or scratch chrome rod. Compare the end connectors of your lift support to the illustrations provided and see additional instructions below.