I assume one of your track rods is bent. You can just replace a single track rod and/or the track rod end, the track rod unscrews from the rack although sometimes they are a bit of a pig to get off. Any motor factor should be able to get the parts for you.
A tip for when you do replace, count the number of turns when you take the track rod end off the old track rod then refit it using the same number of turns. If you do that then your tracking will be quite close to ideal and you can then drive the car to have the tracking set without killing your tyres. Good luck
