Gary is of course correct. Size is 24F. CCA may range from 575 to 750+. I just bought a battery for my 69 with 351W 4V and chose the battery with the highest CCA (750) and longest full replacement warranty (3 years). Additionally, I like to place the reproduction Autolite cover on the battery, so I chose a battery with a flat top and side vents. Not all 24F batteries will have the same top configuration, but should have the same dimensions.