My 104k vi has a much larger bore than a modern Selmer. In fact a bit larger than my 81k vi. My 228k Selmer has the same bore as a modern Selmer, however; I actually use a high-copper series iii neck on it (which I originally bought and used on a series ii horn).
As Simon notes, the series iii neck shape is right within the range of variability of all of the vi necks I have owned, but that series ii neck is quite different.
I would never try to put a II neck on a MK VI because of its high arch, which makes the overall length shorter, which completely changes the ergonomics of how you hold the sax. It does this by having to be raised with the strap and because the horn is closer to you. This changes everything and I believe was the primary reason for the failure of the MK VII which was the first one with this neck style.
I have a VI and a Selmer USA and I use III necks on both. The Series III neck is a reproduction of the MK VI neck from the late '50s on. They sell a ton of them and the reason is its the best thing to happen for Selmer tenor players since 1974.
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