WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
(Adapter hose) Liquidation of existing inventory and then available only as a complete tool set 13 5 270 (83 30 0 491 310) - as of 22.05.12.