Gday, I've got a 55 Ranch Wagon & the aftermarket window reg's have died, in the elec motor. They seem to be the same kit as that 'Aeroflow" sell. My question is, what are the differences between 4 & 2 door window Reg's? We don't have many 2 door 55/6's over here, certainly none delivers new from the factory, so wondering if there is much to modify to get a 4 door mechanism to work. Thanks in advance