http://www.ebay.com/itm/Super-rare-5-string-Rickenbacker-bass-body-candy-apple-red-/171031448505?pt=Guitar&hash=item27d244cbb9
The seller says he has the 5-string bridge.
(http://i.ebayimg.com/t/Super-rare-5-string-Rickenbacker-bass-body-candy-apple-red-/00/s/MTYwMFg2MzY=/z/BQUAAMXQM0FRfBBW/$T2eC16VHJIYE9qUcNk48BRfBBWSfHw~~60_12.JPG)