I suppose the easiest thing to do would be to just get a set of vents with cables. You may be able to convert the others but it would probably be more work. I've only seen the cable controlled vents on the '60-'62 trucks, but they may have been available in later years too. My '61 has them.
TruckNut
Be kind, courteous, cheerful and helpful - And someone will take advantage of you.
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