I was thinking the long shaft PT was for the 19 inch alloy decks as well
from what I can see, some 19in alloy have a ring under the 4 strokes, others don't
Now I have also worked out 19in alloy deck PT's use the EN73096A blade boss - the same as the tornado (long boss) as opposed to EN72644B (used on the 18 inch)
So you might be in the clear - the tornado engine may fit
