This lock has a steel housing and hook, a round-end face-plate. The distance between mounting holes is 3-11/16". The key way is at a vertical angle when hook is fully extended. The hook is spring-loaded,  and has an adjustment screw for proper installation.

This lock has a steel housing and hook, a round-end face plate. The distance between mounting holes is 3-11/16". The key way is at a vertical angle when hook is fully extended. The hook is spring-loaded, and has an adjustment screw for proper installation.