This connector converter can convert a 4.75 x 1.75mm male connector to a 5.5 x 2.1mm male connector.
The back end of this converter is a 4.75mm x 1.75mm female jack:
It can plug to a 4.75 x 1.75mm male connector, convert it to a 5.5 x 2.1mm male connector like this:
