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Prior to 1948, the speedometer gear charts also took tire sizes into account. After 1948, the sizes were confined to the rear axle ratio. 17322 is the base part number but the prefix makes the year range that it was used in. The change to the 9-inch rear axle may have had an affect of sizes after 1957 but a lot of the gears are the same or similar. Mercury cars had the Dana 41 and 44 rear axles so they had some different ratios than what the Ford car axles had. The earlier manuals had fiber gears and the automatics changed over to nylon gears. If the color is for tooth count difference then you need to know if you need more or less teeth on the gear and what color represents that tooth count.