I have just bought and fitted new batten sets for my November 2014 vintage 7 & 9 sails.
Measuring just the battens overall, without the adjusters on the top two battens they are exactly the lengths given in David's post.
Overall means measuring battens 3 & 4 to the tips of the inner claw.
The Adjuster for the top 2 battens adds at least 2 cm to the wings when the batten is inserted to full depth.
When the batten is at full depth and the grub screw just engaging the head of the grub screw is flush with the adjuster.
However it was not possible to fit the top #1 battens to both the 7 & 9 sails without shortening the battens; by ~ 5 mm on each batten. Strictly this contravenes the class rule, but the adjuster wings overlapped the webbing loops and couldn't possibly engage.
The wings on the adjuster are offset. The moulded nib on the body has to be away from the sail, i.e. on the outside exposed side.
Not all the adjuster wings engaged equally between upper and lower webbing loops, on some one loop is tighter than the other.
The #2 battens could be fitted as supplied.
Both sails new #1 & #2 battens widths had to be reduced over some 5 cm in order to fit the adjuster. The adjuster batten socket is 4.5 cm deep.
Both 7 & 9 sails #1 & #2 batten adjusters grub screws needed between 1 - 2 turns to tension the batten.
This seems right.
Both #1 & #2 new battens are substantially thicker and stiffer than the originals.
The inboard ends thickness / depth had to be tapered to engage fully in the luff batten holder; as were the originals.
The 9 sail #3 & #4 battens couldn't be replaced.
My 9 sail #3 & #4 batten pockets are ~ 10 cm too short:-
The original battens are length 750 mm, the same as the 7 sails'; versus the 850 mm length supplied, and specified in David's input below!!