Bolt pattern measurement: The TRUE bolt pattern is the diameter of the circle ALL 5 LUGS are placed on, through the center of each lug.
The best way to measure this is shown in the diagrams below, refrencing the MEASURED BOLT PATTERN specifications.
A FORD bolt pattern will measure 4-5/16" between studs------this is still considered a 5-4.5 bolt pattern.
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All prices are in USD.