In inches (which seem to be the dimensions used for batteries) it is 7.5" wide, 8.0" high and 5.0" deep. Mine is a MAXX Heavy Duty NS40ZLS and is an Australian branded battery.
It came with the car and looks fairly new - I don't know how much it cost though. My car is a 1968 500F and should use the same battery as your 1972 500F.