Gold Medal Models also makes them - catalog #160-161 "Fold-to-shape all-weather cab windows for twelve first-generation diesel locomotives of the following types: Also S-2, Alco RS-3, Fairbanks Morse H12-44, EMD GP-7 & 9, EMD SD-7 & 9, and EMD SW-1200. Some windows can also be adapted to other types as well. All sets are relief-etched in .010" brass. brass." -Mark
The MLE ones shown above will be a little large for the WSOR units, but they should work well enough for you. Use a little CA to fill in the corners before you paint them silver.
