On the fintails, the vin (more like a serial number, actually) can be found stamped on the front right frame rail beneath the air filter. It has a six digit chassis number, a two digit market/transmission number, and a six digit serial number.

There is also a plate on the upper radiator support just to the left (right if looking from back of the car) of the hood latch with the same numbers.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"