If I'm remembering correctly, the A93 option is off a Deputy Challenger, which had rear side panels that didn't have the window crank opening cut out (or plugged). As Ted said, you'd just need to find some regular regular door panels if the holes were never cut (or pull the plugs) and find some quarter panel regulators and window tracks. [eBay probably has a couple sets on there.] I'd assume the quarter glass used with cars with the A93 option were the same as those used in the other Challengers that were moveable, so you should just need to install a new set of quarter window sliders. [Paddock or YearOne carries these kits.]