Phil.. Turn your wheel and take a look at your current control arms. If they have a tab and you see the end links are connect from the CA to the sway bar then you already have the 97-03 style CA. If you don't see a tab and the end links are connected from the strut to the swaybar then that's the 04-05 style CA then yes you'll need to swap CA/swaybar
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Do I look at the front or the back struts? Sorry, I'm a new GXP owner.