Special outlet with no gang box

Hi All, I have an outlet I want to replace. It is mounted on the side of a kitchen cabinet. The outlet is not mounted in a box, it seems to have its own little box on the back with all the connections inside. I'm having trouble finding another one. Does anyone know what these are called? I was going to just replace it with a 1 gang box and a standard outlet, but there isn't room behind it since there is a drawer there. There isn't even room for a low profile box so this unit seems to be my only choice.