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This lady may be able to help.
http://www.oilclothbytheyard.com/pages/about-us
Also you might consider a vintage spare tire cover made out of fabrikiod - here is a link to a site ... Like the cabe where these guys wheel & deal ( sorry for the pun )
http://www.mtfca.com/discus/messages/257047/280977.html?1333956998
Unfortunately, old fashioned oilcloth or Fabrikoid is just not made anymore. Waterproof "oilcloth" is just wax impregnated cotton, and the "oilcloth" for table covers is just shiny vinyl. the stuff needed is fabric with either a cooked-in skin of linoleum or nitrocellulose. From burning bits of original fake leather saddles I think most of it was Fabrikoid, at least in the 1920s and 30s. Here is a tiny bit of information on the stuff:
http://www2.dupont.com/Heritage/en_US/1910_dupont/1910_overview.html
But maybe this stuff would be better?
http://www.hollanders.com/index.php/sample-book-imitation-leather.html