I would not buy Coker tires. They're for show, not driving. They're made on 80 year old, worn out molds and and are hard or impossible to balance properly.
Even Corky Coker suggested to the president of the Peach State region of the CLC that if you're building a show car, buy Cokers. If you drive your car, buy Diamondbacks.
Diamondback makes a 700x18 blackwall radial for $349. It's expensive but it will be superior to anything Coker makes.
Auburn Deluxe Radial
https://dbtires.com/product/auburn-deluxe-radial-15-16-sizes/?style=blackwall32.5 dia
5.5 tread width
7.5 section width
1929 lbs load capacity