Similar to the PA-18A baggage door this STC'd/PMA'd modification is best when installed on a cub that is in for a recover job but it can be installed on a covered aircraft as well.  Kit comes with everything you need to install the door and is designed to nest between the lower brace tubes, the longeron at the bottom of the right side window and the lower side stringer.    

This is  one of our best modification kits for your Piper PA-18 Super Cub and makes your life much easier!