bolt. Left.REGULAR CAB. PartQualifier: bolt. Retainer. Right.REGULAR CAB. A bolt used to attach the Uniside to its mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Roof Panel to it's mounting point. adhesive kit. Rivet. Aperture. Retainer. Uniside.