I'd be very surprised if there was a difference in factory methods. Yes, there are tabs underneath the top of the quarterpanels that fold and hold the wires until they reach the driver's side tail light. There should also be tabs at the top of the rear tail-light panel as well. On my 66 FB from Metuchen, there is a hole for a plastic support within the weaving that goes into a panel just behind the uppermost part of the wheel well; that plastic support usually goes missing or broken after the first removal.