The size I'm running (they're radials) is pretty close to the original 14" bias ply tire size. I'm not 100% sure about 13" but that size you posted earlier sounds about right. Maybe someone can help on this? I'd just be careful not to get something too wide. Here's a link to a place that offers some 13" choices. A phone call there might help you get exactly what you want.
Sams Club lists 3 choices in 185/80R13 - 3 really oddball brands. What's a Greenball Transmaster??? I think the originals were 6.50x13 which is smaller than a 185R13; closer to a 175R13.
Many of the smaller 13" are NLA. They stopped making the 165R13 for one of my cars about 20 years ago it seems. I had to go to a 185/70R13 which is the same OD. A 195/70 would be similar in OD to an original 6.50.
Sorry to dredge up an old post, but wondering if you found the tires you need. I too need the 185-80-13 tires for my '65, but I'm having a heckuva time. Sams lists 3, but they're trailer tires...
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