The Series 870, white Vinyl insulated glass and keyed lock.; Comes as a flush mount application.;;To determine the proper door you want to slide do the following:; While facing the door from the outside looking in, if the left panel slides and the right panel is stationary then you order an XO configuration.;; From the same position if the right panel slides and left panel is stationary then you order a OX configuration. Please note that;a LapSiding application is available as a;special order.; Please call;for ordering and pricing information.