Those are all juniors. They changed size and weights over the years. As for re-wiring, it can be done by attaching a car battery to each end of the through-wire, let it get red hot to melt the plastic and pull out the wire (with pliers.) Rewire through the hole. It is not an easy or safe job, but it can be done. Might be best to just go with the existing hardware unless it is toast.
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