Here is how I replaced the spark plug tube seals in this Hyundai trajet 2000.
Step 1: Removing the Valve Cover.
The valve cover needs to come off. This entails all the coil packs and electricals to be disconnected.
Step 2: Removing the Oem Seals.
The oem seals are all joined together. Easy to remove.
Step 3: Installing the New Seals.
The seals are tapered and go in only one way.
Step 4: Completion.
With the valve cover reinstalled the car is ready for use!