66 dart convertible

Just sat here for the past few hours and looked over your thread. I must say you have done a very very good job with all the patch work. I just picked up a 66 Dart GT convertible with a 273 all original numbers matching with only 63,*** miles 3 days ago. I will be getting hot and heavy into the resto in a few weeks. I have a few questions though. You didnt use the stock seats I noticed. But did you replace the factory rear seat mounts? I know there is one for the air cylinder and another one right next to it that goes toward the front of the car. Do you know what that is used for? Mine didn't come with from seats, but it did come with the rear lower but not the upper. I have been trying to find a replacement panel from the rear section after the seam for the front floor pans but cant seem to find one. At least not for a 66. If you did re use the factory brackets, the air cylinder and the other bracket right next to it, or did you. Just trying to get as much info as possible before I start taring into this thing.