Power Steering Rack Fits Saab 93 Vauxhall Signum Vectra. The seller is easysteer and is located in Bolton. Before you can consider installing retro fit electric power steering there are a few boxes that need to be ticked, its needs to be 12 volt, it needs to be negative earth, there needs to be space in and around the column to house the gearbox and motor (different systems have different dimensions) also you need to consider wiring and rods that run internally up the column, aswell as external column shifts and traficators etc.