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You can dye them about any color you want. Get a good quality vinyl dye (i.e., SEM, etc.) and follow the directions for use. If you don't have spray equipment, buy the bottle/aerosol system sold at a car paint supply place; they work very well for vinyl dye. You can do a lot of pieces with a pint of SEM dye. Good luck!
Clean them extremely well before you shoot the dye. Corvette leather seats have a protective clear coat on them which you will need to remove before shooting your new color.