I don't know much about the 7's & 8's, but the 9's seem impossible with the door/fende in place. If there is an existing cable, you may be able to use it as a fish wire. Maybe someone else can show you an easier way, but I think that you'll have to pull the door, or break the bottom of the fender. My factory service manual doesn't explain the operation, but it illustrates the routing with the door removed.