Nick,
This is a set off the shelf which I had no idea what they fitted.
Specs are as posted except for stem length which seems to be 7.375".
The top nut screws on OK but is a bit rough around the hexes. Looks like this set only uses a one piece top nut set-up.
The bottom cone is pretty rusty, I don't know where you would get the correct size for this lot.
Wouldn't the later set work? The only differences I can see are the stem diameter and length.
Trev.