I know that there are some out there for the aftermarket aluminum radiators, however, I'm not real sure about one with stock fitment? Can't speak for your car exactly, however, my '87 GN OEM Radiator has the following measurements:
Overall Width of 33" Inches
Tank to Tank Width of 31" Inches
Overall Height of 19.5" Inches
Thickness of 2" Inches
Good Luck with it!