Not sure, but the repair manual has the sector shaft packing replacement in the section where the steering gear is disassembled. It says there's a packing retainer, and packing behind that. If you can get the packing retainer out undamaged with the shaft still in place, you might be able to do it. Or maybe there's a modern lip seal that will fit. You can be the guinea pig for that upgrade. We could call it the 52Carl mod.
