100% of the Pantera vendors have ZFs in stock. Some are reconditioned, some are not and some have the optional ring & pinion gears already installed. Should not be a problem to find a usable assembly. Unless you are trying for a cheap one; then you lay yourself open to vast possibilities of buying a damaged or non-home-repairable unit. I have seen NOS ZFs that were unususable without a total rebuild due to corrosion from sitting in storage 40 years.
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