How can I get a new Rickenbacker to sound like the 4004 II? I love the looks and the playability of the 4003 but prefer the fatter humbuckingsound of the 4004. I know seymor duncan, bartolini and Alembic makes replacement pickups (if my memory tells me right). has anyone changed to humbuckers on a 4003? I´ve also heard that the horseshoe pickup gets a fatter sound but I don´t think I could get used to the pickup cover-thing.