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If you're running bigger tires or just focusing on hill climbs you might find the stock vertical link speratation a little lacking. This will raise the upper rear links but about 15MM.
You'll need to secure it throught the old link mounts with a screw and a nut. It also uses the truss servo mount holes to secure it on the back. We beefed it up a bit so it should last. The tougher you are on your rig the tougher the materials you should choose.
Make sure you have enough upwards clearance to raise the links, some chassis/cages will need modifying.