The Creamery (based in Manchester, UK), who make excellent pickups, used to do Ric-style pickups (announced 2015) but they don't seem to be available any more. Rickenbacker are very protective of their products, and it's very difficult to mention the words Ric or Rickenbacker in a description before their lawyers slap an injunction on you.

So it's very hard to get good look and sound alike pickups for a Rickenbacker. As they intended, if you want a real Ric sound, you really need to buy one.