340 K Member ??

Both my '72 Duster 340 4 speed (August '71 build) factory front & rear torque boxes & my '72 Demon 340 automatic (May '72 build) no torque boxes, both do not have the washer. Both power disk brakes, power steering, sway bar, no A/C cars. The Demon has 892/893 torsion bars but I'd have to assume the Duster as well.