The items that fit your Mitsubishi Diamante are shown below.

The Mitsubishi Magna was a large sedan produced by Mitsubishi Motors Australia. The third generation built between 1996 and 2005 were also named Verada and Solara in their home market depending on the trim level.

It was exported to New Zealand, Japan and the USA as the Mitsubishi Diamante.

It received a number of minor facelifts in its life time and a major facelift (easily seen from the change from rectangular headlamps to larger triangular ones) in 2003. These changes do not affect what is needed to change the radio and all come as standard with a double DIN sized aperture for the radio.