I think this is what you need:
 NOS Hirschmann Radio Antenna Key Porsche 911 912 356 | eBay
That is the same "antenna key" That came with my stock manual antenna on my 79 Targa.
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79 SC Targa
72 T Targa Sold
68 T Coupe Sold
65 912 Coupe Sold
62 356B Coupe Sold
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