I had to help take care of my brother's (06 GT) - took it to an upholstery shop here close by and they said they have done a LOT of Mustangs and (I think) a good deal of Explorers. They said that the way Ford designed the door panels for those years was just....they should have done better.
For both panels, it cost $400. If I would have looked around, i MAY have been able to find a better deal, but he was getting tired of driving around with NO noise dampening from the doors. Lol.
2009 G.O. GT, Spoiler delete, JLT-style CAI, Bama 93 Oct tune, Quantum Motorsports brake duct cooling kit, SHR quarter-window louvers, MGW short-throw shifter, Steeda UDPs, JLT oil separator, FRPP FR500s mufflers, MSD coil-on-plugs, FRPP 1.5' drop shocks/struts/springs, FRPP sway bars, Michelin Pilot Sport A/S Plus tires, stock 3.31 gears