Spare tire and rim size for 70 Duster

I just checked, my tire is a 225/70R14. A 185 tire would certainly be narrower like goldduster318 has. I didn't check my actual rim size...is it stamped in somewhere?

COuld the 69 Valiant have had a 13 inch super narrow rim all around back in its day? Would a 13 inch rim fit a small bolt pattern 70 A body?

Big E