All three of the Challenger convertibles I have owned were like that. One is a 71,the other two are 70s. The two Barracuda convertibles only had one catch per side. One was a 70 the other was a 71. I'm guessing it may be because the Challenger has a two inch longer wheelbase than the Cuda,right in that area. Maybe all the pans were made to fit Cuda's,and the second bracket was added when it was used for a Challenger.