They'll ask you for what kind of car (make, model) & engine (2.0 Zetec I4). Just remember to ask for the 180 t-stay. They won't give you the wrong part. If you're nervous about getting the wrong parts, just post the part #s in this thread and somebody will tell you if they're the right ones or not... And since it seems that you're really going to do this, do you know how to do it?