Installation structure for installing and removing a sacrificial glazing panel. There is disclosed a removable retaining member for the sacrificial glazing panel that laterally pressures a primary glazing panel to seal and hold the primary glazing panel and holds the sacrificial glazing panel without lateral pressure. A unitary, dual-durometer retaining member is disclosed which is optimized for holding the primary glazing and the sacrificial glazing panel in different manners by having materials of two different hardnesses. Additionally, a retaining member is disclosed that has flocking material to reduce rattling of the sacrificial glazing panel.