The Chassis mounted servo kit comes complete as shown with all hardware needed.
If using this kit the Vanquish wraith panhard kit is a option. ***HERE***
You can run the chassis mounted servo with out the pan hard kit. If you run this way you would keep your links stock with all 4 links still attached.
If you run CMS and the panhard, it requres you remove one of the two upper links to make it a 3 link setup. If you run 4 links and the Panhard there will be binding in the suspension.
A new drag link with traxxas ball ends or VP drag link is required to replace the stock drag link. ***HERE***
The panhard axle mount has two mounting holes, so you can set this up with either stock knuckles or VP high steer knuckles.