I have searched the web till I am dizzy. Maybe you can give me a short-cut.
   1964 Dodge B body. 15 X 6" rim - zero offset. Tire size on it now  225 - 75R - 15
Problem: the front of the tire rubs the lower fender well front edge at the bottom.. 
  I need a smaller diameter and maybe a little narrower tread & section width. 
 It must be blackwall ( No raised white lettering ) and as plain and smooth on at least one sidewall 
as I can get. Easier cleaning and I like that look.  Brand not important and not high priced. 
 What are you useing that may work for me?  Thanks for any input.......................MO