[QUOTE]Speedunlimited My 1973 Mustang Mach 1 came with a factory Goodyear collapsible spare tire, the rim measures 15-3/8 ( outside edge to outside edge)[/QUOTE
That's a 14" rim or its not factory. A 15" rim was not available on 73 Mustangs regardless if they were Mach 1's. The only optional (fancy/performance)wheel was the 14" aluminum, slotted kidney bean for 73.
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