Help with Bucket Seat Assembly
OK, the first thing you want to do is verify your frame button type. You have the early hinge cover hardware, so hopefully you have the matching rear frames also.
On the latch side of both seats, since the covers & foam are already on, feel for the newer type button box as shown at the bottom of the image below.
If the box is not there & assuming the frames have not been altered, you should be good to go.