As far as the old crystal 78 rpm cartridges, I don't recall ever finding one that was still good. And, I've seen a lot of them, over the past 20+ years. I've used West-Tech services to rebuild two crystal cartridges and I was pleased with the results.
If you're sure the cartridge is good, you can get a new sapphire needle from west-tech services.
If the cartridge is bad, you can also install a current production cartridge; but, you may have to get creative with the mounting, wiring, and adjusting the tracking weight.
For tonearm wire, you could probably use the insides out of a telephone cord or a mouse cable.
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