I love the way wide whites look on pre 47 Chevy trucks.. but the 'beigewall' syndrome is what keeps me from pulling the trigger on a set.
The most recent copy of Hemmings Classic Car I picked up has an ad for an outfit called Lucas Automotive that claims they have 'the best vintage tire deals since 1957'. 1-800-735-0166 and wide white radials appears to be their thing. It's a full page ad, but no website address.. but they say you can call and request a free catalog or quote.
They also appear to sell trade-in's & warehouse clearouts.. and they sell Goodyear Radial wide whites, which they claim are the only wide white made in the U.S.A.