Fern,
These headers are TTI p/n 440-178. I have copied the text below right from their web site. I bought the Challenger with these headers and decided to bring the car back to completely stock configuration so I'm not totally sure where that dent came from, but yes there is a dent there.
OEM with torsion bars or Rack & Pinion without torsion bars
Note: Headers will not clear Unisteer Rack and Pinion
Fast Ratio Pitman & Idler Arms: ? (answer to be updated after fit-check)