+1 on the Diamondbacks. I purchased directly from them and got the same type tire as Fred Puhn described in his post for my 1941 model 120.
Took it for my first drive on Saturday evening and the ride and handling are remarkable.
Because they are a truck tire with a bias-tire measurements they have the correct aspect ratio you need to make the tire look period correct, i.e. NOT a radial look.
Click on their catalogue here:
http://www.dbtires.com/2012_catalog/2012catalog_Lo.pdf and go to the bottom of page 20. See their listings for "Pre-1948 Luxury Cars" fits 15" wheels.
Or give them a call and tell them what you are looking for and they are happy to help you out.
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