A couple of questions; How rare is cruise control? What was the first year it was offered? In the 1966 or 1967 models was factory cruise rare? How interchangeable are the units? How rare are the 8 tracks? When was it first offered? Was it 66 or 67? I'd like to find a factory cruise set up for both of my big Buicks, but have never ever seen a car so equipped. Anyone ever done the conversion on their car?