I got mine from Diamondback Tires in SC (
http://www.widewhitewalltires.com). They have great wide whitewalls that worked well on my '50. However, one of the tires had a whitewall go bad after 2000 miles. They gave me a discount on the replacement tire and I kept the old one as a spare.
They are steel belted radials and ride great.
The tires were $174 each
