The information about the model S is engraved on the inside of the bag door. It uses the same motor as the Automatic F model, which are the standard Elux carbon brushes with the screw hole in the 90 degree flag
Brown to match the Olympia
Silver Grey to match the Silverado
Seal Grig / Jadestone to match the Diamond Jubilee
Seal Grig / Taupe to match the Marquis Delux
Part way into the Run of the Marquis it was replaced with the LE.