taken from Stu Ritter's book, "Mercedes-Benz E-Class Owner's Bible 1986-1995", BentlyPublishers. and these threads:

http://www.peachparts.com/shopforum/733117-post2.html
http://www.peachparts.com/shopforum/528189-post1.html
http://www.peachparts.com/shopforum/1408489-post9.html

Problem All E-class
Clacking noises at A pillars near engine hood hinges.

Possible cause, suggested repair
a. Weld seams between reinforcement panel and A pillar missing. Weld panel to A pillar
b. Check wheel house paneling behind reinforcement panel for cracks. MIG weld cracks.

From the drawing the reinforcement panel would be near the top of the fender and weld to the pillar comng down from the roof.

It shows 2 weld points upper point 40mm top to bottom lower point 20mm top to bottom.

The wheel house Paneling (behind it) extends down from the upper frame piece along the top of the fender.