The MkII and MkIX tail surfaces are identical. Some MkIX aircraft had the broad chord, pointed rudder of the MkVIII and that is what I think BobH is referring to. I've never heard of a Spit having any type of fold down antenna. If you look closely at drawings of the MkII and MkIX cowlings you will see the extra panel line on the MkIX which indicates where the fuselage was extended. I believe it is at the firewall itself. If your Spit has a seperate cowl then you will need to remove the proper length from the trailing edge. If your cowl is part of the fuse then you will need to remove it at the scale seperation line and then shorten it. (I'm assuming a glass fuse) The hardest part may be finding the rather blunt spinner in the proper scale. Good luck with it.