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I believe the rear has no adjustment so you will need at least one bolt to get the rears to equal (if they aren't already). When I had my alignment done (STI v4) the rears were -1.0 and -1.3 so I had the bolt fitted to the -1.0 side so they are now both -1.3.
The fronts are set at -1.0 and this was achieved through the standard adjustment available i.e. no aftermarket bolts required.