[tom406]

Re:'69 Shelbys- Up to about car 2074, most Shelbys were built with E70-15 tires until they started building them with the upgraded Boss302 spindles and bearings, which Ford determined were needed to handle the stress of F60-15 Polyglas tires. There's a bulletin asking dealers to swap tires on any car with F60s not built with the Boss spindles, for safety reasons. (Which was all for naught when they got fitted with G60's and L60's on deep dish Cragars shortly thereafter....)