ok I just checked out some rides like yours on cardomain.
From what I can remember by looking at pics is that you have to start with the wood trim across the dash.
Remove it first using a panel popper, it should just be held by clips.
Under the wood trim there should be some 7mm bolts holding the dash piece that surrounds the radio.
Next lay on the floor and look at the under dash & there should be some more 7mm '*
If the dash feels solid when you are pulling on it or prying use caution there is probably a bolt you missed.
These are just general guide lines, cause like I said I haven't worked on one of these in about a year.
92 Bonneville SSEi - Stock - Remaining repairs needed due to neglect by previous owner - ABS/Trac, AC.
Mods so far: Maganflow High flow Cat, Rebuilt */C
Future Mods: Interior swap for Leath, High Output Altenator, Crazy system, Climate Control swap & Custom Exhaust/Intake.
98 Dodge Stratus - Wifes Daily Driver
92 Dodge Shadow - My Winter Beater