Tire size for fender well headers??

tensec340 said

Ply Rating:8Tire Overall Diameter:26''Tire Tread Width:4.8''Tire Section Width:6.3''Wheel Diameter:15''Approved Wheel Width:3.5'' - 4'' - 6.5''Tire Weight:19.0 lbs

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Do you know what the backspace on those wheels is?