Disclaimer: I am not a professional upholsterer, This is how I did mine after looking at videos and reading info and trying things
To do both seats is a pretty involved process, at least 4 days for a superman (it took me a month, on and off in the evenings). So make sure you have everything before you start and can live without driving the car for a while
Tools you will need:
Small bolt cutter (for removing hog rings)
Bag of 3/4" hog rings (usually comes in bags of 250 rings)
Hog ring pliers
Philips screwdrivers (medium and large)
Various pliers and pry tools
Dremel with cut off wheel
Supplies you will need:
New seat covers
New seat foam
Jute felt carpet under-layment (ask for remnants)
Spray and brush-on contact cement
Spray and brush white lithium grease
Rust reformer spray paint
1/2" high density foam sheets
Felt, a yard should do, any color you want
14" tie wraps
Black duct/fabric 2" adhesive tape
Black and Stainless steel spray paint
Chrome spray paint
Krylon Fusion satin spray paint (for plastic to match interior color) Or SEMS product
Catalogs have the lower side springs repair kits available, but if the larger springs are broken, you will have to make your own. The seat bottom springs are .130, Amazon has small rolls of springs available "Zig Zag Auto Upholstery spring" #10 is .135 (good for bottoms), #11 is .120 good for backs. Cut and bend as needed.
Step 1: Disassembly
Remove headrest, pull straight up until the catch stops it. Move catch tab aside and pull up until headrest comes clear. Only friction hold it in place.
Remove seat from car, 4 bolts hold it to floor (2 F & 2 R). You will need to move seat back and forth to gain access to all bolts. Place seat on a worktable with enough room to work.
Remove headrest bezel: two screws hold the plastic cover one, remove them and the bezel. Then 2 longer screws hold the catch arm metal plate to the seat, remove them and the plate.
Remove seat back: Tilt seat forward to gain access to hardware. Using a small pry bar, pull up on arm button clip (round thing above cable screw in pic) enough to get a needle nosed pliers to pinch it and remove.
Placeholder for button remove pics
Plastic arm can then be pulled down (a small tap helps) and out to remove. Remove both covers.
Note: the inside ridge of plastic can be damaged if cover was not installed properly. One of mine was, I was able to straighten it out with some heat and gentle pressure. But be careful 40+ old plastic is brittle.
Remove rest of hardware: remove latch knob with allen key, remove two seat cover philips screws, remove upper bumper (large philips), lower rubber bumper (medium philips) and latch bracket.
Remove Pass side cable: Use philips to remove both screws
Remove arm clips: The arm is held on by an outer C clip and a pressure washer, as well as a plastic washer between the arm and seat vinyl. Pry the C clip out, the pressure washer is a bit more tricky. I use an awl to loosen it (hammer the gaps!) enough to slide off.
Once both sides are free, you can just grasp the arms one side at a time to pull them over the pivots.
Set aside seat back for later and lets work on the base.