My Crash guide lists the same part number for both the door and window frames for the following Gremlin/Hornet/Concords : 70-78 Gremlin 70-77 Hornet 78 Concord? AMC p/n 8122428,-9 the Concord I"m not sure about, the same door p/n is listed for a '78, but doesn't specify whether it's for an AMX or a Concord, as both are listed in that section. I'm betting it's the Concord, which wouldn't have the fastback roofline. But either way, the p/n for all of them are the same, so they should all be interchangeable. Jerry Casper