After marking the green connector on how its connected to the main connector from the floor, you can now pull it with the rest of its wire lenght off from the old seat. Spread the clips(red arrow) thats holding its wire in place by lightly spreading the clips(red arrow). Use a small flat head screw driver.

Remove the belt buckle receptacle from the old seat rail using a 17mm socket. It is advisable to use a six-point socket instead of a twelve-point to avoid striping the head of the bolt.

or a wrench.

Install the belt buckle receptacle with it's wire onto the GT3 Seats! I will update this with the factory torque of this bolt. There will be two small plastic clips under the GT3 seat where you could clip back the wire into place.

After that, you can now position the seat inside the car. Tilt it towards the rear so you could access the seat bottom for the electrical harness connections.

Courtesy of Kerry. This is the way that spacer should look like before installing the buckle receptacle on top of it. Note that the chamfered side should be towards the bottom facing down.

After placing the GT3 seat onto its position in the car(not bolted), tilt it towards the rear of the car to access the seat bottom for the electrical harness connection.

Allign the markings you made on the green connector(buckle receptacle wire) and the main connector from the floor and press them lock together. I secured this connection with spot ties as illustrated.

I then secured the whole harness on the floor using existing holes on the floor with spot ties. **WARNING** ensure that the wires will not be chaffing on sharp edges of the floor metal sheets or get caught with the seat forward and aft movement. This can cause fire**

Apply thread lock on the mounting bolts and install all four loosely first until they are all lined up in their holes. Apply half of the required torque first in cross patern. Then the torque them down to the final 48ft-lbs each.

Remove belt from their bottom connection and route through GT3 seat outboard upper and lower loop holes and back to it's original mouting spot. Then retorque bolts.

YOU CAN NOW PAT YOURSELF IN THE BACK FOR COMPLETING THE DIY.

Weighing scale indicating 50.6 lbs for the powered sports seat with railings installed.

Weighing scale indicating 28.6 lbs for the Euro GT3 Seat with its railings installed.

I knew I was getting these seats from a real Porsche enthusiast when they are so well packed!! Thanks Daryl !!