There are two latches on each side in front. Raise up on these (sometimes you will need a bar to get them loose). Then raise up on the front of the seat, then go in back and slide the seat back to get loose from back hooks. It is best to fold down the back of the back seat first. It is usually a two person job.
Pick up the floor piece, the third seat gets exposed. Fold the seat back and you have the third seat.
Remove the two Allen bolts at the rear end of the seat with a hex wrench, then slide it back.
There is a little black knob on the top left back of the car you see when you raise the trunk lid. Pull that knob. If you close the trunk before putting the seat down it will push the knob back in and lock the seat again.
Slide seat back as far as it will go.Look under the middle of the front of the seat and you will find a acorn nut and bolt ,remove same.Lift/raise the seat slide handle up and push the seat back off the center slider. Note there is a spring loaded pin up front that will release the seat fully and then lift the sucker out
Trace the seat belt back to the point that it is anchored in with a bolt and undo the bolt (using a ratchet is the easiest way due to not having much space) then raise the seat back to the uprght locked position and the seat belt should free itself.
Well in my 68 you lift slightly on the front of the seat and push back there is a clip it sits in underneath and u have to push back till u can raise it up. The back cushion is same principle. Assuming for bench seat.
Raise the seat bottom of the rear driver side seat to access the rear seat fuse box. There will be a small tab sticking out of the seat bottom just as the seat back contacts the seat bottom. Pull up on this tab and the seat bottom will raise and tilt forward. Lift up on the black plastic cover while pushing in on the retaining tabs and remove the cover. Then there will be another black plastic cover with a few holes in it, pull up on this cover and the fuses will be visible.
Raise back seat access to top of fuel tank.
A good mechanic that can fabricate can raise that seat for you.
If you have had to lower the rear seat in order to make more room and then found that the seat belt was locked when you tried to raise the seat then try this; Trace the seat belt back to the point that it is anchored in with a bolt and undo the bolt (using a ratchet is the easiest way due to not having much space) then raise the seat back to the uprght locked position and the seat belt should free itself. Good luck! Once you do this and before you let it down again, go to the dealer and get a replacement seat belt stop pin and replace the missing one. If yo look close you will see the hole where the missing pin used to be.
There should be seat belt mounting points on the floor under the back seat.