Being no replies yet I'll post information about radio compatibility as I find it.
So far it appears the radio plug in for the OEM radios are the same from 1994-2009 from what I've seen on ebay. I have learned some radios needs an infinity amplifier. Without the Infinity amp an OEM Infinity radio may not put out any sound. Regardless whether it is an OEM basic radio or the OEM Infinity radio they appear to have the same plugs. The OEM basic radio will look a little different than the OEM Infinity version (for one thing it won't have Infinity written on it's face) and it usually wont have the anti theft code adaption.
While the plug in for the latest Galant (9g) OEM radios look like they will fit the the 7g galant plug, the radio will not work in 7g as the radio controls are completely different and would require a major mod of the console area to be used.
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