I've got a couple of 68 140s and I've seen piles of
72-74s in salvage yards. I've also got a 70 164.

The 68s all have a rubber gasket around the windscreen
(and it's a bugger to find a new one). The later cars
all have plastic covers around the inside. The cars
with the rubber gasket have a little lip on the bottom
that covers the screws that hold the top of the dash
to the thingy under the glass.
chris