X type Sound System Connections

I want to be able to play MP3s on my personal MP3 player through the X Type single CD sound system.

Is there any way of doing this?

There don't seem to be any inputs on the unit so I was thinking of using a FM modulator to play the MP3s through the radio.

The problem with this is connecting the modulator to the aerial connection on the back of the radio, as it is not the usual car type of connection.

I have not been able to identify the type of connector used, does anyone know?

I will then be able to modify a FM modulator to suit.

I don't want to use the type of modulator that just transmits to air because of the poor sound and interference that I have experienced with them in the past.

Thanks

-- Liam