Hi all, Just fitted replacement black leather electric seats into my 300ce. Had fun fitting a wiring harness into the passenger side, through the door etc, which wasn't electric before, but happy to say all electrics working fine.... BUT!!! Neither of the seat backs are locking into position, and this isn't affected by having the doors closed, engine running etc... There is a vacuum pipe under each seat, which I haven't connected up yet...(missing connector)... does anyone know if this pipe is related to a locking mechanism, or what they are for. The buttons to release the seat backs and tilt them forward have no 'feel' to them, and don't have any resistence when pushed in. Any advice greatly appreciated. Phil..