That's not the correct engine - in 2003 MB went two a 2 air filter unit, with the filters fitting in the plastic compartment over the cylinder heads.
The 03 5.0L engine is 113.967
I believe you have listed the older version of the 113 (like the 4.3L found in the 02 E430) - 113.940 with the filter on the side like in the picture.
Here is a picture I found on eBay:
http://i3.ebayimg.com/01/a/000/77/d5/3e78_4.JPG