I'm pretty sure the two are keyed alike in 70. (Door and ignition) Someone else more familiar with the early 2nd gens will need to confirm. Getting the door lock cylinder out is pretty easy, it just takes some creativity in tool fabrication and usage. Getting it reassembled (with the window and door panel in place) IS kind of tricky but I've done it before. Call a lock smith and talk to them. The service call is probably worth the money if you can avoid tearing into your door or steering column.