In 1968 the wheel base changed and remained the same thru 1972.
1967 was 115" for both 2 & 4 dr
1968-1972 was 112 for 2 dr and 116 for 4 dr. & station wagons.
Track from side to side changed slightly but don't have info with me as I am on the road.
If I were guessing the difference would be under the back seat area to give more room to those in the back seat on 4 dr/sw.
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JLP
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