Mechanically or powered activated, retractable, partition-able enclosure-panels with or without custom brackets for any style open-air-vehicle having roof structures, including cars and boats, is taught. The partition-able enclosure panels for a driver's side, passenger's side, or rear opening of an open-air car, each include two or more partition-sections, and a rotatable spindle, where each of the partition-sections is designed to be attached to and detached from an adjacent partition-section, and each of the partition-sections is fixedly or non-fixedly attachable to the rotating spindle, so that when the partitions are attached to each other and the spindle is rotated all partitions are controlled by said rotating spindle and when the partitions are detached from each other, only the fixedly attached partition is controlled by the rotating spindle providing for deployment or un-deployment of either a panel or a partition-section. A roof or roof-support with built-in panel supporting devices is also taught.