When my driver's side window was missing, I bought a sheet of clear plastic from a crafts store- the type of material that goes over a framed poster.

It is fairly stiff stuff, so i cut it so that it fit in the frame of the window. Used an exacto knife I think.

worked great for a few days.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E