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I changed out a 01 full bench to a 04 60/40 with no problem but that was on a crew cab. The seats in general are about the same from one supercab to another supercab or crew cab to crew cab. Most holes are under the carpet.
for the seatback cushion, I think you put yours hands at top & bottom of the back cushion about 8-12" in from either end... push in and up (at the same time), and the back should come off the retaining clips.