This connector converter can convert a 5.5 x 2.5mm male connector to a 5.5 x 2.1mm male connector.
The back end of this converter is a 5.5 x 2.5mm female jack
It can plug to a 5.5 x 2.5mm male connector, convert it to a 5.5 x 2.1mm male connector.

Overall Rating for Y53 Power Connector - 5.5 x 2.5mm Female Jack to 5.5 x 2.1mm Male Plug