Yes the grills should interchange between 72-74. I don't believe there were any other significate exterior changes. At some point around or after 74 the gas tank got moved from inside the cab to the frame. Also the instrument panel was changed somewhere thereabouts as well. I know that 77 is different than 72, but I don't know what year the change occured. The 5 bolt wheel pattern of the W100's also got smaller sometime in the 70's if I recall correctly.
Bucky
Bucky
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