I don't have any sleeve nuts that aren't holding the cylinder head down so unfortunately I can't do a useful photo of those.
Drags seem to have all the studs/nuts available, they have some photos but not dimensioned except for the info that the standard 1954-on nut (169-54) is 7/8" under head.https://www.draganfly.co.uk/ariel/4-str ... head-valve
They've got the wrong photo for 169-54 (they show a bolt) but the photo for the alternative stainless-steel item looks to be correct!
Seems there's a slightly different part for the earlier VHA/VCH (although the stud is the same) - looks very similar to the later item, maybe that 'under head' dimension was changed.
Hope that's some help.
'55 Huntmaster, '56 VH, ' 51 VH, '80 R100RT, '00 Sprint ST (but all those Ariel parts can only make one running bike...)