Unfortunately, the intake bridge also has to be removed to change the line. It is recommended to replace these parts immediately to save time and effort.
Vacuum line: http://de.bmwfans.info/parts-catalog/... Vacuum hoses
Connection piece breaks very easily when old: http://de.bmwfans.info/parts-catalog/...
vacuum hoses
Connection piece (breaks very easily if it is old): Link to the component
Also don't forget to get a gasket kit for the intake manifold.