Group 53 batteries until 64, then group 22-24 until 1969. Excellent information here on original batteries thanks to the CorvairKid website. Use a type 22 or 24 if your car has been converted over to an alternator system, instead of original generator! http://www.corvairkid.com/batteries.htm
group size 47
Group size 75 or 78.
Ddd
205/75/14
26R-VL
2.5 cubic feet
group 78
9/16
Any place that sells batteries can tell you the correct size battery. The AC/Delco battery is one of the best.
Group size 34/78 800 CCA will work fine.
Stock wheel size was 13". A 175/80/13 Closely resembles the stock tire size.
Anyplace that sells batteries can answer this question for you. On a 2009 model car the battery is still under warranty.