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Oldsmobile - Mechanical Speedometer You will need to inspect and count the teeth of the original odometer gears before ordering. The most common tooth count is 24. On some models will need to cut off one side hub. {Diameter: .650" or 16.53mm, width of gear .125" or 3.18mm, width with hubs .270" or 6.87 mm} Known to fit: Eighty-Eight and Ninety-Eight 1986-1991 $25.00