the strut bar goes on the bolts from the strut hat, not on the actuall rod in the strut. Kevin is talking about a different part. To install the strut brace you bought you will probably need to pick up a few washers, like 3 for each nut, you'll see why when you go to install it. All you do is take like a 12mm socket and a ratchet and take the nuts off, place the washers on the bolts that are pointing through and place the strut brace on, then put the nuts back onto the bolt and tighten them down.
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Formally known as Asio.