Here, bottom and top view of the axle, after a little light cleaning, along with the spring bottom plates (one being used for support).
And another view, with the differential removed, and the axle upended to drain out the few drops of remaining oil. When removing the differential, there was a forgotten pocket of oil in the casing which happily poured out onto the floor. Now the whole house smells vaguely Land-Rovery from the subtle sulpherous odour of EP90 - which isn't necessarily a bad thing. : )
Removing the axle casing revealed the dowels for the front springs. I don't know if these are both original; it may be necessary to order replacements. Why?
This is why. The head may be the right size, but clearly the threaded part on this one is not, extending a good two inches below the spring! (The other appears to be a correct length.) And while both heads are identical, they are both somewhat smaller than the holes in the axle supports that sit over the dowels. I'll have to see what the head sizes are on the originals, and take it from there.