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try a cover from a new body style 80-97 should work.
1979 F350,4x4,NP435,5:13 gears,Detroit locker in rear with hardened shafts,ABR in the front,L&L Ladder Bars,360 with 428 crank & rods,390 HP heads,Centerforce Dual Friction Clutch,MSD Ignition,39.5x18 Boggers,bucket seats out of a Lightning,& a Southern Body that is perfect.
1997 F350 PowerStroke 4X4,36 Inch Super Swampers, Strait Piped, Chiped, Propane Injected, LUK Clutch
I have actually found several places that deal with those years and the covers will fit, but tend to have a 2" 'overhang' on each side due to different bed side curvature.