JM 4 Level 51

I seem to have a different level to the one shown in a walkthrough, trying to put puzzle together of a plane, have 3 pieces left and they do not seem to fit, no clues given and I cannot move on as there is a key there which I presume will release when the puzzle is finished, help please

I ,,am having the same problem as JM4. The pieces do not fit and I cannot move on.

However, my level says 60.