I have had over twenty E bodies,and I never had any with shims in that area. Maybe they had an issue with your car on the assembly line,getting the fender to align,or maybe you car was repaired by a body shop sometime in its lifetime.

70 Charger R/T SE 472 Hemi 70 Charger R/T convertible 70 Charger R/T V Code Sixpack 69 Charger R/T SE Sunroofcar 68 Charger 383 68 Charger 318 71 Charger R/T 70 Challenger convertible 71 Challenger convertible 71 Cuda 340 09 Challenger R/T Classic