OK, perhaps I figured this out. We DO want the ones that say Polyglas F70-14 on the tire.
They are actually the Goodyear Custom Wide Tread Polyglas mentioned by Dave above. See here:
http://www.universaltire.com/cart.ph...ategory_id=345
Sorry for the confusion. I know that Ricks or some other place I saw only sells the tires that say Polyglas on them without the tire size.
Hope I got that right. They're too expensive to mess up. haha.