On the Desoto it was a very small oddly shaped piece of metal on the passenger fender in the center of the side trim I believe. I saw one about 4 months ago down in OR and the owner point it out. What he said was that Desoto put it on their cars to piss of Chrysler because it was becoming increasingly clear that Chrysler intended to subdue and eliminate the brand.
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)