Unfortunately, the only 4spd AT shift quadrant conversions that I have seen in the aftermarket are for factory floor shifters. You didn't specify the year, but if the car is 1969 or newer, you MIGHT be able to pull the shift quadrant from a 1980s B-body column and retrofit it to yours. Most of the 1969-up columns are internally similar. This requires significant disassembly of the steering column.