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They will fit on the studs, and the offset will be right. they are usually only 15's though which will be a problem if you have the larger front brakes.
Next question, which Legacy? No issue with fit if they are OE as off set and sizing is fine. One thing to note is that some will clear 4 pots (they are the same as those on the UK Impreza), whereas older 17s, from the BD/BG era won't clear the 4 pots (if that is an issue for you).