It looks like if you buy this set, it is already fitted (one side to the other). If this is the case it should be a drop in part. I am interested to hear if another forum member can confirm if these come already fitted.
Fitting aside, installation can be straight forward. Removing the Hammer Spring first can make things easier by eliminating the force of the Hammer on the Sear Cage. After that, you lift the forward leg of the Sear Spring up and out of the slot in the Left side safety lever. You can trap the Sear Leg with the plastic tube from a compressed air can or a WD40 can. This can help you get control of it so that you can swing it up and out of the way. Then you slide out the Left side safety lever and rotate and remove the Right side safety lever. Removing the Right side safety lever will free the Sear Cage. This is because the Sear Cage is retained into the frame by the safety levers. While holding the Sear Cage in place, you can now install the replacement Right side safety lever, it should go in at an angle and rotate into place. Once the Right side is installed you can install the Left side by retracting the left side safety detent with a probe/pick and slide the Left side lever into place. You then drop the Sear Leg Back into the slot in the new safety lever shaft to retain the safety levers.
This procedure is covered in this guide with pictures.
CZ Tuning 101 with Professor Atlashttps://forums.brianenos.com/topic/191773-cz-tuning-101-with-professor-atlas/#comments