Have you removed the glove box? I have used a very long slotted screewdriver and with leverage on the slotted screw, been able to remove the square nuts off the firewall side. I have angle screwdrivers, but am unable to apply pressure to keep em from spinning. Spray lube them good, used plywood and rags for neck support good lighting and patience. The last parts truck I dissembled, I drilled a hole in the dash and was able to stick the screwdriver directly into the slot. But that was a parts truck. I guess as a last resort you could do the same, but then will need to deal with an extra hole in the dash.
Dale
