Interchangeable Power Cords - Magellan


I have a Magellan TR5 Trail and Off-Road GPS, I want to hardwire the power cord. The issue, no one seems to list a hardwire cord for the TR line (TRX 7, TR7, TR 5) of GPS. Does anyone know, are the power cords interchangeable within the Magellan GPS's? I find other hard wire cords online, I've contacted Magellan, they were less than helpful.