When did Ma' Mopar start putting door / crash bars in the doors of our cars? I have tried searching for an answer but search overload occurred. Does any one have any solid info?

Ryan "Bigs" '73 Duster (BLKDUST) - Black, 100% factory sheet metal, flat hood, 346 cid, J Heads, and a bench seat. http://s268.photobucket.com/albums/jj1/bigsbigelow/ Best to date: 12.40 @ 109 mph