Indeed, the 105.012-63 To 105.012-65 usually came with 1506/16 endlinks (but as mentioned above be careful of shaved 19mm endlinks, should be 20mm).
The later 105.012-66 HF & CB often came on early 1039/516, knowing that those started in late 66.
There are of course exceptions based on production dates, so serial or, even better, Archives extract could shed some light on what you are searching for.
My last note is be careful of link counts (short) and date stamps when buying online
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