First get a look at the standard 4x4 look of stock CLS:




I was thinking is there a way to make a fender well extension to make the Arch Opening smaller?

A diffrent approach than lowering... whose theory: http://www.kent.k12.wa.us/staff/trob.../po2000/henry/

Example:

 

Oh man, if they make a fender well extension, i'll be all over it. i really need to get rid of that gap but i cant because of my rim/tire setup.