Look where the headlight would be and you should be able to see the wiring. It could be they used a wiring adapter that just plugs in to the original harness which is what you want to see. If it has a bunch of those scotch lock connectors and the original terminals still there that is not too bad to undo but if they cut the wires off and tied onto them it could be a problem. Finding an original headlight and turn signals might be difficult.