There are two different part numbers for the rear beam - the drum brake cars could have either (with or without the Z-Link) and disc brake cars can only have with the Z-Link (at least in 2012, as its listed).
From the looks of it - as long as your beam (16) has the mounting holes for the Z-Link end links, and the support (4) has the hole to bolt the central link into, you'll only need to buy the Z-link itself.
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