I have done this on my 1986 245. I put the headrests in for my growing kids safety and did not want the headrest rods ripping through thier backs which is likely if you just drill holes and put the headrests in. I bought a used back of rear seat on ebay. The frame of the seat back is different. It has metal re-enforcement for the headrest rods. The bottom swivel on each side of the seat back is spring loaded. Put a large flat blade screwdriver against the head of the swivel pin and move it out so it releases from the body. The Latch Pins on the car need to be changed as well, try to get them with the seat. The piece of floor that lifts when the seat is open is not connected to the new seat back. These are springed hinges. I have them but haven't found them necessary. Color in not crucial.I used the cover from my old back,it fit except the release handle is a different shape and needed some carpet gluing. Its hard to get the plastic tubes out of the seat back that has the headrests. These are the holes the headrest rods slip into. They pull up but clip under the top metal edge of the seat. Pry and twist. I broke one, but volvo has them$$.I use zap straps to replace the bull clips on the bottom edge of the cover. Vinyl spray worked well to change color of rests and some small pieces. The new seat used TROX screws. Thats all I remember. This turned out to be a longer story than I expected.Good luck. Ed
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