Hello. If there's an original F70 14 General Scrambler tire, solid white letters, in the trunk of a 1973 Road Runner survivor, which brand white letter tires went on the 14 inch rally wheels? All the vintage ads show Goodyear Polyglas. It seems odd to me that the factory would use General for the spare and have 4 Goodyear tires on the ground. Your knowledge is greatly appreciated.