Hi Max,
I`m not this far on with my Spit, but have looked at your question and have come up with this.
You should have 3 metal plates with the wing details in them.
One supplied in pack 27 stage 103
Two supplied in pack 27 stage 104
In pack 31 stage 120 step 11 there is a diagram indicating which parts are which.
You should have one of the upper plate shown and two of the lower one.
Stage 120 step 13 uses all 6 part A`s and 14 part B`s
You should therefore have 4 part B`s and 6 part C`s left over at this point.
Stage 121 step 12 uses 4 part B`s and the 6 part C`s on the upper wing surfaces.
Hope this helps, sorry if I`ve over simplified this but didn`t want to miss anything out.
Regards
delboy271155
(Derek)
COME BACK GUY FAWKES "YOUR COUNTRY NEEDS YOU"