I have spares for the Wellers which I have on the Ital axled/Triumph pcd Seven.
These are not the issue.
On the 21, with Ford pcd hubs, it originally wore the 16" HPC wheels. Then, for a while, I used a set of the 15" multispoke wheels before returning to originality.
It appears that the wheelnuts currently residing with the car & wheels have a sleeve on them, which does not fit inside the holes in the HPC wheels.
I have no idea how these could have been mixed up and certainly I'm sure the nuts I took off (18 months ago) sat against the wheels well.