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If you are putting Polyglas on a 69 Z you are using the wrong tire. you would need the Goodyear Wide Tread GT...not Polyglas.
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Charlie,
I would make sure that he got the right tire!!! The tires that are produced in that size are the Speedway Wide Tread GT for the '68-'69 Z, and the Speeedway 350 in two variations depending on which Shelby you have!!!
