Abstract: A lock structure arranged in combination with a vehicular cover is constructed to include a flexible cable sheath having a plurality of cable strands directed therethrough, with a forward ring mounted to a forward distal end of the sheath and cables. An anchor block mounted fixedly to a rear distal end of the cable has an anchor ring secured thereto for positioning with a vehicular passenger compartment. The cables and sheath are directed through a grommet portion of a vehicular flexible cover, with a lock mechanism mounted through the forward ring. A modification of the invention includes alarm structure mounted within the anchor block.