This is from a drawing in "Fazination SL, W113" published by Mercedes-Benz.
Looking at the car from the front. The measurement from the outside edge of the front wheel well flare to the outside edge of the bumper mounted round fog light is 335 mm (13.2 inches). The measurement from the ground to the bottom of the bumper mounted round fog light is 490 mm (19.3 inches).
They actually reversed their conversions in the book. They said:
335 mm = 19.3 inches
490 mm = 13.2 inches
Obviously they transposed these conversion numbers.
Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both tops
1994 E420