Here is the 1972 Lincoln Mark IV. it was larger than the 1968 Mark III and heavier. the wheel base was also stretched. in 1973 Ford was forced to add heavier bumpers to the front of cars due to a new law that stated cars had to survive an impact at 5mph. by 1974 rear bumpers had to meet the same requirements. to do a 1973 Lincoln Mark IV just use the front of the 1974 Mark IV, and the rear of the 1972 Mark IV.
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