This any good
http://www.ebay.co.uk/itm/BMW-Z4-SWITCH-CONTROL-PANEL-GENUINE-OEM-NEW-CONVERTIBLE-SWITCH-RRP-172-/310414140307?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item48461fe393
EDIT..Just noticed it does not have the roof buttons but advert states Convertable. :? :?