I don't drive, so I'm not sure., but I'd recommend going into your nearest auto supply store and take a look at what they have. Look for something that increases the dimensions of the steering wheel as something that's thicker is is easier to grasp, as well as something with some texture. One of those artificial sheepskin things might do it for you. If you don't find anything, ask your doctor for a referral to an occupational therapist - they're experts in finding ways of making your life easier by adding doodads.
good luck!
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