ok, sorry, i'll try and specify:
with "three pieces" i basically mean three sheets of wrap. that means there is three places where you see the wrap being glued together (don't know the english technical words).
i have included 3 pictures, don't know if they are of any help. on the pics you can more or less see the places where the wrap is glued. the distance between those "glue-points" is always 2 lugs, so the sheets of wrap are all the same size. one "glue-point" is under the lug next to the muffler, one is on under the lug next to the strainer.
the sheet that is worked into the shell seems to be original, it looks perfect at that point. but don't know about the rest. could the other parts be re-wrapped, or could i as well be original although it's not just one sheet...