To be honest you would be better off going to see Paul at Car Tyre World, he is a lot cheaper and knows what he is doing, you are also better off getting someone with experience of setting up a Subaru to do it, think Paul only charges £60 and will give you the setting that best suit you, if your car is lowered etc it will need a slightly different arrangement than it does on standard springs.
Will sort out a number for him when i get in tonight, they are in tudhoe near spennymoor.